H12: Project to establish the scientific and technical basis for HLW disposal in Japan, Supporting report 1: Geological environment in Japan
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増田 純男; 梅木 博之; 清水 和彦; 宮原 要 ; 内藤 守正 ; 長谷川 宏; 岩佐 健吾
not registered; not registered; Shimizu, Kazuhiko; Miyahara, Kaname; not registered; Hasegawa, Hiroshi; Iwasa, Kengo
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The geological environment has two main functions in terms of ensuring the safety of geological disposal. One relates to the fundamental long-term stability of the site and the other to the properties of the host rock formations and groundwater which facilitate the emplacement and functioning of the engineered barrier system (EBS) and the natural barrier function. With these functions in mind, the feasibility of selecting a geological environment in Japan, which is appropriate for geological disposal, is discussed, based on findings obtained from case studies and field measurements. (Methodology Long-term stability of the geological environment) Japan is located in a tectonically active belt that surrounds the Pacific Ocean. Volcanism, earthquakes and crystal movements are features of such active belts and are more significant in Japan than in most other countries. Therefore, important natural phenomena to be examined in Japan include fault movement, volcanic activity, uplift/d