Abstract
By using the new analysis method which focuses on stationarity of microtremor (ρ curve split calculating method), The S-wave velocity structures were obtained from the phase velocity dispersion curve with a smaller array size. In this way, we carried out microtremor array observations at 30 sites which cover all of Osaka City area. Consequently, 4 cross sections of east-west direction were obtained in the area spreading about 10km from south to north and 15km from east-west. From the east-west transects 4 cross sections, we could indicate that the S-wave velocity structures provide the obvious difference of the upper level of the basement rock between the west-and the east-side along the Uemachi fault．
