Landslides

1
Landslides
2
Total damages costs since 1900
Drought
Wave
Extreme Temp
Volcano
Flood
Storm
Earthquake
Slide
For all the natural hazard the global costs have
been increasing
3
Total damages costs since 1900
Drought
Wave
Extreme Temp
Volcano
Flood
Storm
Earthquake
Slide
In term of costs Earthquakes, Tropical Storms,
and Floods are the most expensive geological
hazards Epidemic and Famine have been
historically the most devastating in term of
casualty Plague in middle age killed 1 every 3
european, Spanish Flu Pandemic 1920 30 million
4
Landslides cost
In US landslide cost an Average of 1 billion
per year And 25 casualty per yr (USGS web
page) In New Zealand landslides Causes an
average of 3.5 millions NZ of damages Per year.
5
Slope stability
Effect of grain size and water
6
Slope stability
Effect of water
7
Slope stability
Summary
8
Forces on a slope
a
9
Classification
ROCKS REGOLITH
FALL SLIDES FLOW
FAST SLOW
10
Classification
11
Classification
12
Classification
ROCKS
Fall
Flow/Avalanches
Slide
13
Classification