Normal Fault Scarp

Normal fault scarp (2.5 m high) produced by the earthquake of October 28, 1983, at Borah Peak, Idaho. Nearly dip-slip slickensides on the fault surface are visible on the lower half of the scarp. Photo credit: R.C. Bucknam, U.S. Geological Survey. Image from website: http://www.ngdc.noaa.gov/seg/hazard/slideset/10/10_slides.html