Slides
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Occurs on a slide/ slip plane or
what is known as a failure surface, which is lubricated by rain water which had
infiltrated along this major line of weakness.
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Slides may be rotational or translational
(planar).
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In the planar slide, the
weathered rock moves downhill leaving behind it a flat rupture surface.
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Where rotational movement
occurs, a process sometimes referred to as slumping, a curved rupture surface is
produced. These are mostly slides,
usually along more than one slip plane, which is curved. These have a variety
of names but are essentially the same process. The more resistant/ permeable
rock e.g. limestone remains, while the clay material slumps into blocks on slip
planes.
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Impacts on slopes: Stepped
uneven profile, scars, slumped block and a toe of material at the base.
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