Development of a Statistical Strong-Motion Evaluation Method Considering Regional Variation of Source and Path Effects in the Tohoku Region, Japan

Abstract eng:
A ground motion prediction equation for strong motion spectra is empirically developed for the Tohoku region, Japan. Spectral inversion analyses of S-wave Fourier spectra and 5% damped response spectra of identical datasets are conducted. Based on the results of the spectral inversion, PGA, PGV and response spectrum are modeled as a function of moment magnitude, stress drop, distance with three types of Q, and Vs30. It is found that the variance of the source term is significantly decreased by adding stress drop as a parameter. This indicates that taking into account regional variations of source radiation strength is effective to reduce the uncertainty in strong motion evaluation.

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