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| | Abstract | | To evaluate the geological discontinuity is one of the important factors to conduct high level radioactive waste disposal. A Reverse Vertical Seismic Profiling (RVSP) using blasting vibration and survey lines placed in the -300m research galleries of the Mizunami Underground Research Laboratory has been carried out to obtain three-dimensional geological image such as faults and fracture zones in granite during the research galleries excavation works. In this study, results of RVSP are compared with existing information such as sonic logging to estimate spatial distribution of faults and fracture zones, and the applicability of this method to estimate geological structure in the granite is discussed. |
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