论文信息 - Modeling spatial correlation of ground motion Intensity Measures for regional seismic hazard and portfolio loss estimation

Modeling spatial correlation of ground motion Intensity Measures for regional seismic hazard and portfolio loss estimation

Theprobabilisticassessmentofgroundmotionintensitymeasures(IMs;e.g.,peakgroundaccel- eration) at an individual site is a standard practice. Less attention has been devoted to estimating the statistical dependence of IMs from a single event at multiple sites due to common source and wave traveling paths and to similar distance to fault asperities.This paper explores the site-to-site correlation of IMs and demonstrate its use in seismic hazard and loss estimation.The use of a spatial correlation function will be shown in two applications: 1) evaluation of the effect of modeling spatially correlated ground motion fields on loss estimates for portfolios ofstructureswithdifferentspacingpatterns;and2)simulationofU.S.GeologicalSurvey(USGS)groundmotion ShakeMaps consistent both with the recorded IM values at each station and with the IM correlation structure. This last case could be extremely valuable in USGS-sponsored efforts such as PAGER and ShakeCast.

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