Probabilistic seismic hazard assessment for the sliding displacement and liquefaction potential of offshore sites

Abstract

This research is intended to present probabilistic sliding displacement and liquefaction hazard assessment procedures where expected sliding displacement of offshore slopes and factor of safety against liquefaction potential of subsoils are derived for extreme level earthquake and abnormal level earthquake conditions, as defined in the ISO 19901-2 guideline. These probabilistic approaches rigorously account for the variability in the intensity measure (e.g. ground acceleration), the variability in the engineering demand parameters (EDP) (e.g. sliding displacement and factor of safety against liquefaction), and the variability in the soil input parameters required to compute the EDP. The procedures are applied to a hypothetical site in the vicinity of oil and gas platforms located in the Santa Barbara Channel in Southern California.