In this paper, the results of PS-logging conducted in Chiba city and the northwest area of Chiba prefecture are used to estimate S-wave velocity of the surface ground. This area consists of diluvial formation, alluvium and filling soil. Based on the regression analysis, expressions that give S-wave velocities of sandy soils and cohesive soils from SPT N-values and depth are proposed, as well as standard values of S-wave velocities for humic soil(peat) and Kanto loam.
