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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