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| | Abstract | | Crystalline rocks are considered to be a target rock mass for high-level radioactive waste disposal. To dispose high-level radioactive waste in hard rocks, it is important to evaluate the distribution and characteristics of fractures for groundwater pathways. In this study, we performed seismic tomography and vertical seismic profiling (VSP) to accurately explore the distribution of three-dimensional fractures in hard rocks. The results demonstrated that the low P-wave velocity measured by seismic tomography and the concentrated area of the reflected wave measured by VSP appeared in the same area. This area corresponded to the concentrated area of fractures interpreted by geological features. This suggests that the concentrated areas of fractures can be detected by seismic tomography and VSP. |
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