THE INFLUENCE OF S-WAVE VELOCITY OF SUBSURFACE LAYER ON TRANSFER FUNCTION OF MODEL GROUND

Abstract

In this study, we investigate how the vertical distribution of shear wave velocity has effects on the shape of transfer function of subsurface layer. The effective coefficients for transfer function and its maximum peak value are defined on the basis of partial derivatives of transfer function regarding to shear wave velocity and thickness of a layer. The effective coefficients are calculated to several subsurface layer models in Japan. It is concluded that the effective coefficients of the shear wave velocity of upper layer and base rock are generally larger than those of the medium layers. However, in the subsurface layer model which has relatively large shear wave velocity and large thickness in medium layers, it is found that the effective coefficients in the medium layers are considerably large.