Part three地难豪层的量 Mass Wasting Processes BEDROCK Creep Creep is the slow, downslope movement of soil weathered rock, or other surficial debris Movement is by quasiviscous flow occurring under shear 是一叫“m stresses sufficient to and ol san cla c下xR produce permanent CONSOLIDATE MATERIALS deformation but too small MIxED ROCKS AND SOIL MOSTLY PLASTIC to result in a discrete Rock failure surfacesuch as a landslide RAPID RA种 OTDVEHY x制 ATE RATE OF MOVEMENT Rapid earthflow -Y RAPID Very tapid PID TO VERY AAPT 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