Encyclopedia of Natural Hazards

2013 Edition
| Editors: Peter T. Bobrowsky

Slide and Slump

  • Lionel E. JacksonJr.Email author
Reference work entry
DOI: https://doi.org/10.1007/978-1-4020-4399-4_323


Slide A slide is the displacement of a rigid or semi-rigid mass of soil or rock so that it descends along a distinct underlying failure surface under the influence of gravity. If the failure surface is planar, it is referred to as a translational slide.

Slump. A slump is the name given to a slide when the underlying failure surface is curved rather than planar. The motion of a slump is rotational, so that portions of the slide drop and rise with respect to the adjacent stable slopes. It is more properly referred to as a rotational slide.


Slides and rotational slides (slumps) include downward and horizontal displacement of rigid or semi-rigid masses of soil (earth and debris), or rock under the influence of gravity. This includes movements of land and the sea bottom. It differs from a collapsewhere displacement is entirely vertical. Landslides are classified according to the type of material that is moving or has moved, the type of movement involved, and the...
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© Springer-Verlag Berlin Heidelberg 2013

Authors and Affiliations

  1. 1.Pacific DivisionGeological Survey of CanadaVancouverCanada