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GEO 207
Mass Wasting
23
Geology
Undergraduate 2
10/06/2011

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Term
mass wasting
Definition
downslope movement of Earth's materials
Term
free face
Definition
rock that's exposed, no soil, and no vegetation on the rock (drier climates)
EG: Yosemite
Term
talus slope/pile
Definition
rock that detaches from the preface, gravity pulls and it ends up at the bottom
Term
concave/convex/straight slopes
Definition
more humid, soil, and vegetation
EG: Santa Cruz Island, CA
Term
slope stability
Definition
driving forces v. resisting forces
Term
driving forces
Definition
gravity
Term
resisting forces
Definition
material, cohesiveness, friction
Term
what happens when driving forces overpower resisting forces?
Definition
mass wasting
Term
variables of mass wasting
Definition
material types, slope angle, slope topography, climate, vegetation, water, and time
Term
what triggers mass wasting
Definition
heavy rains, flooding, thawing, earthquakes, fires, volcanoes, and humans
Term
Landslide in Thistle, Utah
Definition
1983: costliest landslide in US history; 400 million dollars; in 1999 it moved again
Term
why will mass wasting increase in the future?
Definition
urbanization and development, deforestation, and global climate changes
Term
Landslides in Illinois
Definition
more than 8 million dollars in damage since 1928
Majority induced by construction
most occur along the MS and IL river
heavy rain triggers it
Term
how to minimize mass wasting hazards
Definition
making a surface drain: mitigate for the natural hazards
soil cement being applied
drain to let water from slope out
piles into stable rock
fill for house pad
put in net/fencing
can install a measurement that measures how fast, how much, etc.
Term
rock fall
Definition
individual rocks fall through the air and may accumulate as talus
Term
slump
Definition
cohesive blocks of soft earth material slide on a curved surface; also called a rotational landslide
Term
soil slump
Definition
soil and other weathered earth material slide on a tilted surface of bedrock or cohesive sediment; also called a debris slide or earth slide
Term
rock slide
Definition
large blocks of bedrock slide on a planar surface, such as layering in sedimentary or metamorphic rocks
Term
avalanche
Definition
granular flow of various combinations of snow, ice, organic debris, loose rocks, or soil which moves very rapidly downslope
Term
creep
Definition
very slow, downslope movement of rocks and soil
Term
earthflow
Definition
wet, partially cohesive and internally deformed mass of soil and weathered rock
Term
debris flow
Definition
fluid mixture of rocks, sand, mud, and water that is intermediate between a landslide and a water flood; includes mudflows and lahars
Term
complex
Definition
a combination of two or more types of sliding, flowage, and occasionally falls; forms where a type of landslide changed into another as it moves downslope.
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