Abstract
Sakaiminato City, Tottori Prefecture, Japan. Explorations using surface-wave and microtremor were carried out in the same area to investigate a cause of the appearance of strong seismic intensity. We observed the surface-wave at 2 lines (A-Line and B-Line), about 1km length. S-wave velocity structure cross-sections of 2 lines were obtained by CMP analysis and 2D inversion.
The 2D S-wave velocity structures to the depth of 15m were as follows. A-Line is a gradual increase from surface layer Vs=150m/s to bottom layer Vs=200m/s. B-Line is 2-patern structures. A surface layer is low velocity, about 120m/s, at North area and high velocity, about 170m/s, at South area. The strong seismic intensity zone consists in the low velocity area.
