Abstract
The terdiurnal component tide is chiefly consists of the harmonic function of third order of tide generating potential (W3) which is dependent on the term of fourth power of the parallax of the moon at the observatory. The relation constants (l' and h') between the earth-tidal displacements and the potential W3 is determined in the same manner to Love's number h and Shida's number 1. In this paper, the relations among l', h', l and h are computed on the assumption that the earth is an incompressible and homogeneous elastic sphere. The observations of tidal linear-strains are performed in the various directions at Osakayama Observatory and Kishu Mine and the some values of horizontal areal strain are obtained. From these observations, the observed values of h'- 6l' are computed. According to these observations, the values of h'- 6l' are as large as about ten times of the value which is calculated on the assumption that the earth is a homogeneous and incompressible elastic sphere and the mean rigidity is 2 × 1012c. g. s.. But the observed phase lags of M3-tide components of the strain elements agree with the theoretical values of the components in the all observations.
