A New Zealand framework for predicting risk due to rainfall-induced landslides

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SR_2012-022-pdf
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Buxton, R.; Dellow, G.D.; Matcham, I.R.; Smith, W.D.; Rhoades, D.A. 2013 A New Zealand framework for predicting risk due to rainfall-induced landslides. Lower Hutt, N.Z.: GNS Science. GNS Science report 2012/22 12 p.

Abstract: An approach for calculating the likely risk to a portfolio of assets due to rainfall-induced landslides is presented. The method allows for the effects of slope, vegetation and geology on the likelihood of landslide hazard for a given rainfall level. The effect of the hazard is then extended to derive the likely direct cost of a rainfall event for a distributed asset portfolio. Only building losses are considered in this report, but with minor modification the general approach could be applied to other asset types. Strengths and shortcomings of the method are discussed, together with proposed extensions to the method to be included as part of an ongoing program of work. (auth)