Developments in Geotechnical Engineering, Vol. 14A: Rockslides and Avalanches, 1: Natural Phenomena focuses on attempts to provide a foundation for studies of mass movement phenomena in the Western Hemisphere. The selection first elaborates on Albert Heim's observations on landslides and relevance to modern interpretations, Frank rockslide in Alberta, Canada, and Lower Gros Ventre slide in Wyoming, U.S.A. Discussions focus on geologic environment, events triggered by rise and fall of slide lake level, description of slide mass and zone of detachment, stability analysis, travel distance of sturzstrom deposits, and geometry of the Elm sturzstrom deposits. The publication then takes a look at Madison Canyon rockslide in Montana, U.S.A., Little Tahoma Peak rockfalls and avalanches in Mount Rainier, Washington, U.S.A., Sherman Glacier rock avalanche in Alaska, U.S.A., and Nevados Huascaran avalanches in Peru. Topics include rockslide kinematics, associated seismic activity, meteorological and hydrological conditions, mode of emplacement of other Alaskan rock avalanches, and applicability of mechanical fluidization to other rock avalanches. The text examines the mechanics of glacier movement, dynamics of snow avalanches, failure of snow slopes, and role of gravity in plate tectonics. The selection is a valuables reference for researchers wanting to study further rockslides and avalanches.