Rotational slides occur when the a landslide occurs in a curved manner concave to the sky. When this type of slide occurs, the upper surface of the slide tilts backward toward the original slope and the lower surface moves away from the slope.

What is rotational slip?

Quick Reference. The semicircular motion of a mass of rock and/or soil as it moves downslope along a concave face. Evidence for rotational slip in cirques comes from the dirt bands observed in cirque ice, which become progressively steeper from the back wall, but then flatten towards the cirque mouth.

How does rotational slip happen?

The base of the corrie becomes deeper due to abrasion . As the glacier gets heavier it moves downhill. The glacier moves out of the hollow in a circular motion called rotational slip .