| 講演要旨(和文) | | 東京大学宇宙線研究所では，新たな宇宙線観測施設ハイパーカミオカンデのための大規模地下実験空洞掘削を計画している．空洞建設候補地選定のために広域の岩体構成及び断層の分布から効果的な全体概査の調査手段について検討し，弾性波探査が最適と考えた．しかし，対象領域は三次元的広がりを有するため，事前のシミュレーションによる理論的考察を行った．また測定上・解析上の課題も考えられたため，大規模探査を行う前に適用可能性を確認する目的で事前測定試験を行った．本論では，解析上提起された問題とその対処法について検討し，本試験に対する提言をまとめる． |
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| | 講演要旨(英文) | | Institute for Cosmic Ray Research, the University of Tokyo is planning to construct a large scale underground cavity for a new cosmic ray observation facility, named Hyper Kamiokande. In order to select the candidate site for the cavity construction, we examined a effective geophysical exploration method for estimation of three dimensional rock mass classification, considering rock formations and faults around the site. As a result of the examination, we thought that the optimal method could be seismic exploration. Before a full-scale exploration, we carried out theoretical simulations and in-situ preliminary measurement tests, to clarify feasibility for large-scale 3-D exploration. In this paper, we discuss some problems raised in the simulations/tests and their countermeasure, and would like to present some recommendations for full-scale exploration. |
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