Mass soil movements in the H.J. Andrews Experimental Forest

Analyzes 47 mass movement events resulting from severe storms during the winter of 1964-65. Earthflow and channel scouring events were the most common. About 72 percent of the mass movements occurred in connection with roads and 17 percent in logged areas. Over 94 percent of the events occurred in areas of tuff and/or breccia bedrock which occupy only 37 percent of the total area.