Modeling of landslides hazards induced by the 2008 Wenchuan earthquake using ground motion parameters

摘要

Studies of earthquake-induced landslides in China using ground motion parameters have been rare. However, landslides induced by the 2008 Wenchuan Earthquake in the Longmenshan area were relatively well instrumented and can be investigated using ground motion records. Analysis shows that the Newmark accumulative displacement calculated from the ground motion data recorded in a particular geological hazard zone corresponds to the hazard intensity in that zone: the larger the displacement, the more serious the geological hazard. Analysis also shows that the displacement is related to the Arias Intensity, which represents the total energy released during the earthquake at the observation site. An evaluation model of Newmark displacement calculated with Arias Intensity was constructed to estimate the subsequent slope failure resulting from the earthquake. The fact that the calculated results based on the model fit well with the distribution of actual landslides shows that this method is useful for hazard evaluation. This type of model therefore can be used as a tool for estimating regional-scale distributions of earthquake-induced landslides and their associated hazards. Furthermore, the technique is useful for evaluating applied engineering needs during reconstruction efforts in the earthquake-hit area.