types of mass movement

types of mass movement

1. soil creep

   • slow movement of soil down a slope due to gravity
     • slowest type of mass movement - 1-2 cm per year
       • Evidence of soil creep
         • Trees grow at an angle.
           • Terracettes form, these are small steps of accumulated soil.
             • Fences bend.
               • Walls crack

2. bog burst

3. mud flow

   • fast moving river of rock, soil and water down a slope.
     • Fast moving. the amount or water and the angle of the slope determine the speed up to 100kmp/h.
       • Usually happens after periods o heavy rainfall

4. land slide

5. avalanche

   • An avalanche is a rapid movement of snow and ice down a slope.
     • Small controlled explosions are used in the alps to cause small avalanches, and thereby prevent large avalanches.

6. lahar

   • River of mud when ash from a volcano mixes with melting snow.
     • Example Nevada del Ruiz
       • 23,000 killed

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