Estimation of fallen block volume-frequency law for risk analysis: an example

Quantitative rockfall risk assessment is a powerful tool for land planning and the structural design of rockfall protection systems. In this sense, one of the most critical and discussed as- pects is the definition of a design block. In the present paper, a method for formulating a block volume frequency relationship is proposed. Two inputs are necessary: a list of observed falling block events and the results of a detailed survey at the foot of the cliff. An example illustrating the calculations is proposed.