A Preliminary Study of Vertical-to-Horizontal Response Spectral Ratios for Taiwan

In probabilistic seismic hazard analysis, in order to construct vertical design spectra that are consistent with the results for the horizontal component, the vertical response spectrum is used to scale the horizontal spectrum by vertical-to-horizontal (V/H) spectral ratios. This study try to develop a ground motion prediction equations (GMPEs) for the vertical to horizontal spectral acceleration (V/H) spectral ratio using strong ground-motion data from TSMIP in Taiwan. A total of 91 earthquakes with 9676 records are selected and nonlinear mixed-effect model with maximum likelihood method is used. A model for the prediction of V/H ratios for peak ground acceleration and spectral accelerations from 0.01 to 10.0 s is developed with a functional form consider with the V/H ratios as a function of magnitude, distance, and site characteristic by using Vs30. The result of the V/H GMPE is used to compare with other model in Europe and North America.