Common types of landslides in Maine

Rotational slide results in a concave surface.
Translational slide moves along a roughly planar surface with little rotation or backward tilting.
Rockfalls happen when masses of rocks or boulders become detached from steep slopes or cliffs and move abruptly downhill.
Debris flow is a rapid mass movement of loose soil, rock, organic matter, and water as a slurry that flows downslope.  
Earthflow is a viscous flow of fine-grained materials that have been saturated with water.
Creep is the imperceptibly slow, steady, downward movement of slope-forming soil or rock. The bluff changes shape but doesn’t fall apart.

 The different types of landslides featured here are from US Geological Survey.