Abstract
Continued to the previous studies, observations of microseisms and microtremors were carried out as steady site observation on diluvium terrace in the NOHBI plain. The seismometer used in this study, the method of measurement and analysis were employed in much the same way as previous papers. Observation had been continued of every saturdays for one year since August in 1977. The purpose of this paper is to discuss the dynamical characteristics along with the change of each season. Analytical results are not only investigated every season but also discussed in view of atmospheric phenomena. Results obtained are as follows. (1) Dominant frequency of horizontal components in low frequency in summer is lower than that in the other seasons. (2) Spectral forms of each season are divided according to the characteristics of dominant frequency and amplitude. (3) The change of Fourier's amplitude is closely related to the change of wind velocity. (4) Mean spectra of abundant observations suggest a good approximation for dynamical properties.
