Slow most active at the surface l falls material free

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– slow, most active at the surface l Falls – material free falls upon failure or undercutting, motion is rapid Rockfalls are the most common form l Slumps – material moves downslope accompanied by rotation l Slides – material moves as cohesive unit along a clearly define surface l Flows – material moves chaotically and in a disorganized fashion l Avalanches or debris flow – involve a wide range of material involvement: trees, soil, and rock
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02/02/2012 18
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02/02/2012 19 May Be Rapid and Sudden
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02/02/2012 20 Becomes a Problem
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02/02/2012 21
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02/02/2012 22 La Conchita, January 10, 2005 (family of victims on right)
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02/02/2012 23 It is not enough to be able to understand and recognize natural hazards. Without enforcement actions (e.g., zoning and oversight) knowledge is powerless. La Conchita has been long known to be subject to large landslides (1995, 2005)
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02/02/2012 24 Different Mechanisms of Soil/Rock Motion
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02/02/2012 25 Geologic Controls: Soil/Rock Type + Weakness Planes
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02/02/2012 26 Sliding Along Soil-Bedrock Interface or Soil Horizons
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02/02/2012 27 Construction of Roads and Structures Changes Force Balance
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02/02/2012 28 Rock Fall
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02/02/2012 29 1996 Yosemite rock fall - killed people and obliterated trees
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02/02/2012 30 Rock Slide - limestone failure, Alberta, Canada, 1903, ca. 80 dead
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02/02/2012 31 Unstable Hillslope (Slump/Complex Slide)
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02/02/2012 32 Morphology of a Complex Slide
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02/02/2012 33 Slow Creep May Lead to Catastrophic Failure
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02/02/2012 34 Clay-Poor Soils Can Fluidize Readily
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