Chapter 15 Mass Wasting: The Work of Gravity

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Chapter 15 Mass Wasting The Work of Gravity
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La Conchita, California
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La Conchita, California

• Landslide prone Coastal Community
• 35,000 ya
• 6,000 ya
• Numerous events in 1800s
• 1995
• 2005
• Solution
• Relocate residents

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Mass Wasting

• Downslope movement of rock/soil
• Need slope
• Need gravity

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Mass Wasting

• Natural occurrence
• Problematic when we are in the way
• Large scale events are rare
• Total effects of small events are huge
• 20-50 deaths in US annually
• 1-2 billion annually

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Mass Wasting

• Does this happen on Long Island?
• North Shore or South Shore?
• Increasing or decreasing on Long Island?

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Earthquake creates landslide, India - 2005
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Rain causes mudflow buries town Phillipines
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Grand Canyon
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Angle of Repose
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Wildfires, California
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Causes

• Removal of vegetation
• Vibration
• Increase slope
• Excess moisture

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Prevention

• Remove excess moisture
• Provide vegetation
• Minimize slope
• Construct retaining wall

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End of Chapter 15