Earthquake-Induced Reactivation of Landslides: Recent Advances and Future Perspectives
Earthquake-induced reactivation of landslides is a focus topic in risk management as severe damages and losses have been caused so far from seismically-triggered slope failures. Slope stability conditions under seismic action have been studied for several decades by pseudostatic solutions as well as by sliding block methods that follow the Newmark’s approach. These last ones were recently upgraded by flexible block methods to provide a more constrained evaluation of earthquake-induced displacements, i.e. by considering the landslide mass resonance during seismic shaking. Nevertheless, all these solutions cannot take into account the very complex interactions between seismic waves and slope that are pointed out by several case histories reported in the literature. Such interactions can be simulated by more sophisticated stress-strain numerical models that need very strong constraints to both the geological setting of the slope and the local seismic response. In this regard, a fundamental contribution derives from detailed engineering—geological reconstructions as well as on-site geophysical measurements. Recent studies have made use of theoretical approaches for pointing out the significance of some physical parameters, such as the ratios of characteristic periods related to the seismic wave properties and to the landslide mass geometry, to provide a more exhaustive prevision of earthquake-induced landslide displacements.
KeywordsSeismic Wave Peak Ground Acceleration Slope Stability Analysis Seismic Input Sine Wave Input
I wish to thank my colleague and friend Luca Lenti who provided the rigorous physical support to the researches carried on together; to Jose Delgado Marchal for the opportunity to discover and study several and very interesting case histories of earthquake-induced landslides in Spain; to Antonella Paciello for her precious contribution to the seismometric measurements in the Italian case studies; to Francesca Bozzano and Gabriele Scarascia Mugnozza, for their guide during several years of scientific co-operations; to my tutor Alberto Prestininzi who gave me the opportunity to approach and to carry on my research.
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