Update of the Chiou and Youngs NGA Model for the Average Horizontal Component of Peak Ground Motion

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Update of the Chiou and Youngs NGA Model for the Average Horizontal Component of Peak Ground Motion and Response Spectra

Brian S.-J. Chioua) and Robert R. Youngsb)

M.EERI

We present an update to our 2008 NGA model for predicting horizontal

ground motion amplitudes caused by shallow crustal earthquakes occurring in

active tectonic environments. The update is based on analysis of the greatly

expanded NGA-West2 ground motion database and numerical simulations.

The updated model contains minor adjustments to our 2008 functional form

related to style of faulting effects, hanging wall effects, scaling with the depth

to top of rupture, scaling with sediment thickness, and the inclusion of additional

terms for the effects of fault dip and rupture directivity. In addition, we incorporate

regional differences in far-source distance attenuation and site effects

between California and other active tectonic regions. Compared to our 2008

NGA model, the predicted medians by the updated model are similar for

M > 7 and are lower for M < 5. The aleatory variability is larger than that

obtained in our 2008 model. [DOI: 10.1193/072813EQS219M]

 

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