Part three地难豪层的量 Mass Wasting Processes Creep Creep is the slow, downslope movement of soil weathered rock, or other surficial debris Movement is by MNOOE RATE quasiviscous flow Earth now occurring under shear atol by bedane plane stresses sufficient to /emend of son clays produce permanent UNCONSOLIDATED MATERIALS deformation but too small MIXEDROCKSANOSoR MOSTLY PLASTIC to result in a discrete failure surfacesuch as a landslide RAPID HAPID TO VERY RAPID tATA APPHOXIMATE科 ATE OF Rapid earthflow Estreme ERY问APD RAPIO TO V HY HAPD Figure 6.1 Classification of landslides(from Varnes, 1958). 环境地质学 Environmental GeologyPart three 地球表层的塑造过程 环境地质学Environmental Geology Mass Wasting Processes Creep Creep is the slow, downslope movement of soil, weathered rock, or other surficial debris. Movement is by quasiviscous flow, occurring under shear stresses sufficient to produce permanent deformation, but too small to result in a discrete failure surface such as a landslide