How does a rotational slide differ from a translational slide?
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landslide
This 1995 landslide at La Conchita, a coastal town in California, swept away a hillside road and destroyed a number of houses.
In geology, the primary difference between rotational and translational slides lies in the geometry of the shearing surface along which the material moves.1
- Rotational Slide: Also known as a slump, this movement occurs along a concave-upward set of shear surfaces. The axis of rotation is generally parallel to the slope's contours. As the mass moves, the top portion tends to tilt backward, often creating a steep head scarp.12
- Translational Slide: This movement involves the displacement of material downward and outward along a broadly planar surface. These slides typically occur along structural features, such as a bedding plane or the interface between resistant bedrock and weaker overlying material.1
While both are types of landslides involving displacement along discrete shearing surfaces, the rotational slide is characterized by its curved path and back-tilting, whereas the translational slide follows a relatively flat or planar path.1