Ancient mass movements can continue to pose hazards. In 1995 and 2005, the community of La Conchita, California, was hit by earthflows and debris flows sourced from an ancient slump.
What is slump?
When a cohesive mass of weakly consolidated materials or a rock layer slides a short distance down a slope, it is referred to as a slump. Movement is defined as sliding along a flat or concave-upward surface. Slumping can be brought on by earthquake shocks, heavy rain, freezing and thawing, undercutting, and slope loading.
In 1995 and 2004, the community of La Conchita, California, suffered from earthflow and debris flow which was sourced from an ancient slump. this shows that ancient mass movements can continue to pose hazards.
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