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Chapter 15 Mass Wasting:
The Work of Gravity
La Conchita, California
La Conchita, California
Landslide prone Coastal Community35,000 ya6,000 yaNumerous events in 1800’s19952005
SolutionRelocate residents
Mass Wasting
Downslope movement of rock/soilNeed slopeNeed gravity
Mass Wasting
Natural occurrenceProblematic when “we are in the way”Large scale events are rareTotal effects of small events are huge20-50 deaths in US annually$1-2 billion annually
Mass Wasting
Does this happen on Long Island?North Shore or South Shore? Increasing or decreasing on Long Island?
Earthquake creates landslide, India - 2005
Rain causes mudflow & buries town
Phillipines
Grand Canyon
Angle of Repose
Wildfires, California
Causes
Removal of vegetationVibrationIncrease slopeExcess moisture
Prevention
Remove excess moistureProvide vegetationMinimize slopeConstruct retaining wall
End of Chapter 15
