The polarization anisotropy of the Ps-converted wave tells us about anisotropic properties of the region between a seismic station at which the Ps phase is observed and a velocity discontinuity at which the Ps conversion takes place. However, it is very difficult to know the anisotropic structure as a function of depth from the polarization anisotropy data because the data are obtained as a quantity integrated along the ray path from the station to the velocity discontinuity. In this study, I present a method to estimate seismic anisotropy of the layers using the shear-wave splitting of Ps phases that originate at velocity discontinuity interfaces in a flat-layered structure. After a description of the method, analyses of synthetic waveforms show that it is of benefit in the study of anisotropic structure of shear waves.

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