Mass Movements

Question 1

Landslide Nature and cause

Answer 1

Nature - Sudden and involve large quantities of rock and sediment, made of coherent block of material that slides over the surface
Cause - Climate, faults, undermining, building, deforestation

Question 2

Mudflow nature and cause

Answer 2

Nature - Narrow incised channel with a long fluid runout to the beach, sediment is small and wet
Cause - Strong rain causes erosion and/or mobilize loose sediment located on slopes

Question 3

What are the different types of mass movements

Answer 3

Mudflow, soil creep, debris flow, landslide, slumping, rockfall, lahar, solifluction, earthflow

Question 4

debris flow nature and cause

Answer 4

Sudden movements usually associated with steeper slopes and large loose materials, more fluid than slides. Caused by rainfall and unstable mass

Question 5

Lahar nature and cause

Answer 5

Type of mudflow or debris flow composed of pyroclastic material with water, flows down side of a volcano. Cause when volcanic debris losses its internal strength causing slope to collapse / rapid melting of snow and ice / convectional rainfall caused by hot air created by the volcano

Question 6

rockfall nature and cause

Answer 6

free fall of rock from a cliff face. Caused by climate, favorable geology, weathering, undercutting, earthquake

Question 7

Soilfluction nature and cause

Answer 7

slow downslope movement of soil due to recurrent freezing and thawing of the ground. Caused by frost creep

Question 8

Earthflow nature and cause

Answer 8

downslope viscous flow of fine material saturated with water. Caused by excess precipitation, elevated ground water levels, earthquakes, erosion

Question 9

Soil creep

Answer 9

Damp soil moves very slowly down a slope as the weight of water pushes it forwards. Caused by burrowing agents, tree throw, absorption of water