GEOL 106 Lecture Notes - Lecture 10: Surface Tension, Transpiration, Yungay, Peru
19 Apr 2018
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Geol106: week 10 landslides and mass wasting (chapter 7) What determines whether a landslide occurs or not: slope steepness (steep vs steeper, nature of the material (soil/aggregates, rock, etc, triggering effects (eg. rain on a slope) A cause is an internal or external factor that, over time, reduces the stability of a slope and brings it to the point of failure. A trigger is an event that sets off the landslide the final straw . The slopes upon which mass wasting occurs may range from steep cliffs and mountain slopes to a very gentle, almost imperceptible gradient. Although gravity is the controlling force, in order to overcome inertia (resistance to motion) gravity may be aided by other factors. May occur from heavy rainfall or snowmelt. Water adds weight to the sediment and gravity pulls it downwards. Roots sometimes split rocks apart: human activity rock cuts on highways, farming, etc.
