masswasting - Landslide potential of regions in the U.S....

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1 Mass Wasting (Mass Movements) • downward movement of earth materials under the force of gravity • slow to rapid rates of movement (landslides) • U.S.: $1.5 billion in damage & 25-50 deaths per year Landslide potential of regions in the U.S. Types of Mass Wasting Types: based on material involved, form of moved material, & speed of movement Types of Mass Wasting 1. Creep : slow, gradual downslope movement; Creep: evidence includes tilted trees, poles, fences, monuments Types of Mass Wasting 2. Falls : free fall of rock upon failure or undercutting; motion is rapid - talus coarse rubble piles at base of slope
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2 Talus from rockfalls: Devil’s Postpile National Monument Types of Mass Wasting 3. Slides : material slips downward as cohesive unit along a clearly define surface Rockslide on Karakoram Highway, Pakistan Slide on Pan American Highway, El Salvador; triggered by 7.6 EQ scarp Slide blocked canyon, cut highway & railroad; Thistle, Utah Types of Mass Wasting 4. Slumps : material moves downslope accompanied by rotation - scarp or steep face may form at top of edge of slump
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3 Slump and flow, La Conchita, California scarp Types of Mass Wasting 5. Flows : material moves chaotically and in a disorganized fashion, as a fluid flows Earthflows in grassland, California Types of Mass Wasting 6. Avalanches or debris flows : involves a wide range of material (trees, soil & rock) in a single flow
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This note was uploaded on 04/07/2008 for the course GEOL 111 taught by Professor Pinter during the Spring '08 term at SIU Carbondale.

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masswasting - Landslide potential of regions in the U.S....

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