Surface features and kinematics of the Slumgullion landslide, near Lake City, Colorado

Abstract

The Slumgullion landslide, in southwestern Colorado, is a complex landslide consisting of an active landslide currently moving on the upper part of an older, larger, and inactive landslide. The inactive landslide occurred 700 years ago and dammed the Lake Fork of the Gunnison River forming Lake San Cristobal. The landslide deposit is 6.8 km long with a volume of about 170 x 10 m . The active landslide, 300 years old, is 3.9 km long and has an estimated volume of 20 x 10 m .