Historic Earthquakes

Borah Peak, Idaho
1983 October 28 14:06:06 UTC
Magnitude 6.9

Largest Earthquake in Idaho

Damage Photos

Fault scarp more than 1.8m in height, northwest of Mackay, Idaho, caused by the October 28, 1983, earthquake.

Brick walls of the old Custer Hotel, in Mackay, Idaho, damaged by the October 28, 1983, earthquake. (Photograph by the Idaho Falls, Idaho, Post-Register.)

Abridged from Seismicity of the United States, 1568-1989 (Revised), by Carl W. Stover and Jerry L. Coffman, U.S. Geological Survey Professional Paper 1527, United States Government Printing Office, Washington: 1993.