Assessment of Earthquake‐Induced Landslide Hazard in Greece: From Arias Intensity to Spatial Distribution of Slope Resistance Demand Article Swipe
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· 2016
· Open Access
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· DOI: https://doi.org/10.1785/0120150172
· OA: W2234008131
The earthquake-induced landslide hazard in Greece is evaluated by \nmeans of a parametric time probabilistic approach. First, by taking into account the \ncharacteristics of seismicity affecting Greece, we calculated occurrence probabilities \nfor different levels of seismic shaking expressed in terms of Arias intensity for a time \ninterval of 50 yrs. Then, by utilizing the linkage of Newmark displacement with Arias \nintensity and critical acceleration, we mapped the spatial distribution of the slope \nstrength demand that imply a 10% probability that displacement will exceed critical \nthresholds for potential seismic triggering of incoherent and coherent landslides. The \nobtained results suggest that the areas of western Greece and the broader region of the \nGulf of Corinth are the most exposed to conditions of seismic triggering of both kinds \nof landslides. The derived slope strength demand maps could provide the basis for the \nassessment of whether particular slopes have a significant failure probability by comparing \nthe estimated strength demand with the actual critical acceleration values calculated \nfrom slope material properties and slope angle. We exemplified this approach \nat a coastal area of the western Gulf of Corinth, where, by considering situations expected \nin dry and wet periods, we also demonstrated that earthquake effects on slope \nstability depend on the season of earthquake occurrence.
