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| | Abstract | | Conventional geophysical exploration methods as an evaluation of natural ground tend to be large in spatial scale and costs. In this study, we attempted to investigate the upper ground from inside a tunnel by cosmic-ray muon. The relative density distribution by cosmic-ray muon investigation showed the lower density near the observation site than the surrounding area. We compared the relative density distribution with the natural ground classification and the natural ground strength. It resulted in that the lower density corresponded to the lower ground classification and the lower ground strength. This might be because the degradation of the natural ground resulted in deterioration of the natural ground parameters, and therefore these areas might have lower density. To confirm the relation between the cosmic-ray muon investigation results and the condition of the natural ground, we need more samples of muon investigations of the natural grounds and to compare them with the indices of the condition of the natural ground. |
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