Mass Movement & Landslides

Mass Movement & Landslides

  • Causes
  • Key features
  • CASE STUDY: Thredbo (1997)
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James Fortson
MASS MOVEMENT & LANDSLIDES
CAUSES
· Groundwater pressure destabilises the slope.
· Erosion of the cliff by rivers or waves.
· Earthquakes destabilises the slope.
· Volcanic Eruptions.
· Intense or prolonged rainfall.
· Mining or quarrying.
KEY FEATURES
· Landslides are associated with:
Sleep sleeps.
­
Permeable rocks.
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Water in the soil and rock.
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Human activity ­ waste tips from mining & road
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cuttings.
CASE STUDY ­ Thredbo (1997)
· This is occurred at the village and ski resort of
Thredbo, New South Wales (Australia).
· Happened on the 31st July 1997.
· 18 people died, $40 million of damage
· 3500 tonnes of debris came down the slope.
· The area was declared a "regional disaster".

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