Interevent variability of spatial correlation of peak ground motions and response spectra

摘要

Spatial correlation models of peak ground motions and response spectra are key components for extending current probabilistic seismic hazard and risk analysis for a single location into those for multiple locations and facilitate broad applications, including seismic loss estimation of spatially distributed buildings and infrastructure and ShakeMap interpolation. One of the important aspects that has not been investigated thoroughly is interevent variability of the spatial correlation among different seismic events. The current study addresses this issue. For this purpose, a consolidated extensive ground-motion database was constructed; more than 9000 records from 41 well-recorded earthquakes were used. The analysis results indicate that the extent of the spatial correlation variability, which needs to be incorporated in seismic-hazard and risk calculations, is approximately ±0.1 units with respect to a typical spatial correlation model.