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USGS CMG InfoBank: Slump

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Comment: 06:57 - 07:45 (00:48)
Source: Annenberg/CPB Resources - Earth Revealed - 16. Mass Wasting
Keywords: "mass wasting", speed, movement, slump, "rocky debris", rainfall, earthflow, bedrock

Our transcription: If we think of mass wasting as a kind of continuum with creep representing the slowest form of movement, the next fastest would be "slump."
Frequently, slump occurs on hillsides that have a thick cover of loose rocky debris.
This takes place most commonly after heavy rains saturate the ground.
What starts out as a block of slumping earth, often spreads out as an earthflow downslope.
Depending on the amount of water, this type of mass wasting can be active over a period of hours, days, or months.
In some earthflows, intermittent slow movement continues for years with large quantities of soft or easily weathered bedrock on the move.

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