Mass-Wasting

1
Mass-Wasting

• Movement of Large Amounts of Material Downhill
  under Gravity

2
Soil Creep
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Soil Creep, California
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Colluvium, San Bernardino Mountains, California
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Mystery or Soil Creep?
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Four Years Mass-Wasting, Bosnia
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Four Years Mass-Wasting, Bosnia

• 10040/2 cm2 2000 cm2 (4 years)
• 500 cm2 /year
• Removed from 1 km slope per year 500 cm2
  /100,000 cm 1 cm/200 yr 5000 cm (50 m)/m.y.
  50m /m.y.

• A 1-m (100 cm) soil mantle yields 500 cm2 /year,
  so movement 500 cm2 /year/100 cm 5 cm/year

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Mudflows, California
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Urban Planning, San Diego
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Avalanche Chute, Colorado
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Landslide, Mount Saint Helens
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Sherman Glacier, Alaska, March 27, 1964
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Viaont, Italy, October 9, 1963
1800 people died.
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Yungay, Peru, May 31, 1970
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Yungay, Peru, May 31, 1970
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Lituya Bay, Alaska, July 9, 1958
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Lituya Bay, Before and After
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The Scour Line
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The Highest Wave Ever Recorded