EXPRESSIONS OF THE ANISOTROPY OF THE CRUST BY MEANS OF THE OBSERVATIONS OF THE EARTH TIDAL STRAINS

Abstract

A weighted function between an azimuthal pattern of an observed tidal strain and that of a theoretically calculated tidal strain is obtained in order to express an anisotropy of the crust. The weighted functions are calculated for the azimuthal pattern of the tidal strains at Osakayama, Kishu and Suhara. The phase angles of the weighted functions show that the axes of the anisotropy at Osakayama concord with the normal direction of the Japan Proper, and the axes of the anisotropy at Kishu concord with the axis of Kii Peninsular. The load tide is calculated as the difference between the observed tidal strain at Suhara and the theoretical direct effect of the earth tide for the earth's model of Gutenberg. The weighted function between this load tide obtained by the observation and the theoretical load tide calculated by use of the oceanic tide is calculated. This weighted function shows that the axis of the load tide is deflected by about 45° by the metamorphical geologic constructions around Suhara district.