Contribution of dendrochronology to the determination of magnitude-frequency relationships for landslides.

摘要: Abstract The determination of magnitude–frequency (M–F) relationships is necessary for landslide hazard assessment. Ideally, this achieved by using inventories past events recorded technical units or aerial photo interpretation. However, direct sources data are often unavailable. Dendrogeomorphological techniques allow us to determine the frequency events, but few attempts have been made estimate magnitude analysing spatial distribution disturbed trees. This paper addresses M–F rockfalls, debris flows and complex slides obtained dendrogeomorphology. cases presented require appropriate understanding both geomorphological context disturbance caused motion on Both small large rockfalls can be identified dated reconstructing trajectories in forest stand. larger rockfall size, longer path, higher number affected trees greater area deposition rock fragments. damaged proposed as an indicator magnitude. extent a series were reconstructed mapping their deposits relative dating criteria Local global mudslide reactivations deduced sampling various tree generations location units. Magnitude–cumulative curves determined three cases.