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LA, Northridge
India, Bhuj
Kashmir The Asian
Tsunami
Montserrat Earthquakes
Tsunami
Eldfell Earth
Volcanoes Hazards
Case Holbeck Hall
Studies
Mount Pinatubo
Mass movement
Flooding
Aberfan
Yangtze, China
Venezuelan
The Netherlands mudslides…read more

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Sheer STRESS and Sheer STRENGTH
How to manage a mass
Sheer stress: the force
Hazards associated with mass movement and slop failure
movement:
acting on a body that
causes movement of the Friction will vary the weight ­
body down slope water
Cohesive forces binding
particles ­clay
Weather and
climate Vegetation binding material-
Erosion by rivers, Slope angle
plants
waves and
solution weathering
Removal of Sheer
underlying support stress
Short-term
stresses
Vibrational
Loading of support Lateral pressure shocks-
earthquakes,
Slope failure is because: movement of trees
Freeze-thaw,
·a reduction in sheer strength, Solifluction,
internal resistance swelling
·an increase in sheer stress…read more

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Sheer STRESS and Sheer STRENGTH
Hazards associated with mass movement and slop failure
Slope failure is because:
Sheer strength: the
internal resistance of a
·a reduction in sheer strength,
body to movement
internal resistance
·an increase in sheer stress
saturation;
Solution of softening
minerals in rock material
or soil
Changes in soil
Hydration of clay Weathering and ground
mins effects water pressure
Disin of rocks
Sheer
strength Burrowing of
Remoulding of animals
sands and clays
Changes in Biological effects
structure
Creation of Growth and
fissures in clays decay of roots…read more

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types of mass movement:
Slow movement- soil creep
Fast movement- avalanches
Dry movement- rock fall
Fluid movement- mudflows
Slides occur when masses of
material move along a slip plane
·Rockslide and landslide ­
weathered rock or rock
Types of mass movement
·Rotational slides- steps or
terraces produced…read more

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Causes:
Impacts:
Heavy rainfall in two
Killed 147
days
Information:
21 October 1966 116 of them were kids
Coal tip built above
in school
spring-
South Wales
Water weakened
2 million tons of waste
sandstone
Human caused down the valley
Previous landslides
Fog delayed people
(1944, 1956, 1963)
Aberfan, south W\ales…read more

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