Varnes (1978) described rockfall as a situation in which rock “… of any size is detached from a steep slope or cliff … descends mostly through the air by free fall, leaping, bounding, or rolling. Movements are very rapid to extremely rapid ….” There are many well-documented rockfalls throughout the world (Evans and Hungr, 1993; Wieczorek et al., 1999; McSaveney, 2002; Strouth et al., 2006; and Ravanel et al., 2010). Most published literature documents relatively large rockfall occurrences. Power-law distributions demonstrate that the more frequent threat involves smaller volume rockfalls (Malamud, 2004;...

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