Abstract
The availability of velocity logging using driving impact of dynamic penetration test is investigating by authors. In that study, it was found that the correlation between the number of hammering, such as SPT N-value, and the maximum amplitude of waves observed at ground surface was very high, although the shear waves transmitted through the various stratum and included many kind of waves. In this study, the shear waves were specified by polarization analysis, and then the correlation between the number of hammering by automatic ram sounding and the maximum amplitude of specified shear waves.