A STUDY ON EMPIRICAL GROUND MOTION ESTIMATION INTRODUCING FAULT RUPTURE PROPAGATION EFFECTS COMPARING WITH GROUND MOTIONS BY FAULT RUPTURE MODEL

Abstract

Fault rupture propagation effects, i.e., radiation pattern and forward directivity, are introduced into empirical attenuation relationship of ground motion. Rupture heterogeneity is also considered as weight of the effects introduced for each small portion of the target fault. Contoll parameters of the effects are adjusted to give seismic intensity distributions around fault area that agree well with the distribution calculated from waveforms by fault rupture model. The present compensation gives more realistic ground motion distribution than the average ground motion by empirical attenuation formulae.