12.5 - Types of landslides

Question 1

what are falls

Answer 1

detachment along a surface with limited shear
material descends by falling

Question 2

what are topples

Answer 2

rotation away from the slope about a point below the centre of gravity of the displaced mass
materials then fall or slides

Question 3

what are rotational slides

Answer 3

downslope movement along a curved rupture surface (bit below its curved)
displaced mass may experience little internal deformation

Question 4

what are translational slides

Answer 4

downslope movement along a planar or undulating rupture surface
during sliding displaces mass is likely to break up and transform into a debris flow

Question 5

what are spreads

Answer 5

materials on gentle slopes moves downhill
occurs where stiff materials over soft materials (soft layer deforms)

Question 6

what are flows

Answer 6

displaced material behaves like a viscous fluid (fast moving 10s km/h)

Question 7

what are avalanches

Answer 7

displaced material behaves like a turbulent fluid (fast moving 100s km/h)

Question 8

what are complex landslides

Answer 8

landslides comprising more than one type
can evolve from one type to another along their path