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| | Abstract | | P- and S-wave velocity logging is one of the geophysical methods which have remained in geotechnical engineering field as the in-situ measurement method for determining P- and S-wave velocity structure of the near surfaces. Regretfully, state of the measurement techniques seems to still be in chaotic situation in Japan and to waste effort by trying to standardize the techniques by non-specialists. Meanwhile, geotechnical engineers have requested geophysicists to provide more accurate and reliable information of near-surface P- and S-wave velocity structure. To do this, it is essential to review the state of the arts of PS logging techniques and clarify the practical problems to be settled. In this paper, the author focus on S-wave velocity logging, and first classifies the problems into sources, tools, and utilization of S-wave velocity data. Next, technical essences on the generation of SH-waves are discussed. |
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