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Landslides (impact (economic infrastructire, population preparedness,…

- - - - very steep slopes (usually rock)
      - fractures
      - falls due to gravity & very fast
    - - material move as a coherent mass along a surface of failure
      - vary from slow to fast (usually soil, rock or debris)
      - rotational slid
        
        intermediate speed
        
        weak material (sediment)
        
        rotation of material on a curved failure plane
        
        curved scarp above the slide
      - translational slide
        
        slow to fast
        
        strong material due to weakness
        
        cohesive motion of material along a flat surface
    - - very slow to very fast
      - soil, mud, wet debris, (rock)
      - water is usually very important
      - fluid or plastic flow of material (chaotic)
      - creep = very very slow
    - - combinations of landslids
- - - - colluvial fan --- formed by landslides
      - alluvial fan --- landslides and rivers together
      - fan delta --- fan that spreads into a body of water