Definition and classification
The Working Party on World Landslide Inventory (1990) defines a landslide simply as ‘the movement of a mass of rock, earth, or debris down a slope’ (q.v.). A more comprehensive definition which helps to distinguish landslides from the other geomorphological processes is ‘the downward or outward movement of a mass of slope-forming material under the influence of gravity, occurring on discrete boundaries and taking place initially without the aid of water as a transportational agent.’ As this second definition indicates, landslides are more than just a simple down-slope movement of material. The three most widely used classifications involving landslides (Sharpe, 1938; Varnes, 1958 and 1978; Hutchinson 1988) separate ‘mass movements’ (Fairbridge, 1968) into two categories: subsidence (which is the vertical sinking of material-see entry on Land Subsidence) and those movements that occur on slopes. These’ slope movements’ are then usually divided firstly into...
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Crozier, M.J. (1999). Landslides. In: Environmental Geology. Encyclopedia of Earth Science. Springer, Dordrecht. https://doi.org/10.1007/1-4020-4494-1_200
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