MASS WASTING
The movement of rock, soil or both under the influence of gravity. may or may not be subjected to the influence of moisture/ water
1. lithology : of sedimentary rock, igneus rock and metamorphic rock (shale, argilite, poor cementation, cracks and joint : are the most susceptible)
2. geological structure : joints,fault, foliation,infill material and bedding (joint : width,density,orientation)
3. soil type : small grain size : lower angle of repose. large grain size and different shaped resulted higher angle of repose
4. slope angle : shear stress is higher than shear strength in steeper slope (gentle : younger slope)
5. slope curvature : cliff, rectilinear, concave and convex
6. anthropogenic : slope cutting, unplanned development
LANDSLIDES : FLOW, TOPPLING, FALL, SLIDE AND COMPLEX
OTHERS : Creep, Lateral Spread, Solifluction, Soil Liquefaction, Avalance and Subsidence
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