Assessment of the Rockfall Frequency for Hazard Analysis at Solà d’Andorra (Eastern Pyrenees)

Abstract

Dendrochronology has been applied successfully for dating different types of slope movements, including rockfalls (Lang et al. 1999; Stoffel et al. 2005; Stoffel 2006; Perret et al. 2006). Rockfalls are downslope movements of rocks and boulders which move largely by bouncing. These characteristics cause rockfalls to leave only fragmentary and scattered evidence on the ground surface but also in trees. As a consequence, it is more difficult to obtain complete time series of events for rockfalls than for other types of slope movements.