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地質環境の長期安定性に関する研究,年度計画書(平成18年度)

Study plan for research on long-term stability of geological environment in FY2006

中司 昇; 野原 壯; 梅田 浩司; 笹尾 英嗣; 齋藤 龍郎; 安江 健一

Nakatsuka, Noboru; Nohara, Tsuyoshi; Umeda, Koji; Sasao, Eiji; Saito, Tatsuo; Yasue, Kenichi

我が国は変動帯に位置しており、安定大陸にある欧米諸国に比べて、地震や火山活動等が活発である。地質環境の長期安定性に関する研究においては、地質環境に重要な変化をもたらす可能性のある地震・断層活動,火山活動,隆起・侵食,気候・海水準変動等の天然現象に着目して、それらの特徴を明らかにするとともに、それらが地質環境に及ぼす影響を解明するための調査技術・評価手法にかかわる研究開発を進めている。平成18年度においては、地層処分システムの成立性に重大な影響を及ぼす現象の存在(例えば、活断層やマグマ等)や、過去の変動の履歴をあらかじめ確認するための調査技術について調査・研究を行う。活断層・地震活動については、活断層の活動履歴と分布(移動,伸張,変形帯の発達過程)の調査技術に関する情報を整備する。火山活動については、第四紀の火山・地熱活動(特に低温領域の熱履歴)や地下深部のマグマ・高温流体等の探査技術の検討を行う。隆起・侵食/気候・海水準変動については、三次元の地形変化モデル等の概念モデルを作成する。

The Japanese islands are located in the tectonically active Circum-Pacific Mobile Belt. As a result, Japan has a high frequency of earthquakes and eruptions. Special consideration is given to the long-term stability of the geological environment, taking into account volcanism, faulting, uplift, denudation, climatic change and sea-level change in Japan. Development of research/prediction technologies for geotectonic events has been carried out to evaluate the long-term stability of the geological environment in Japan. During fiscal year 2006, to confirm existence of the phenomena that have a influence on geological disposal system (e.g. active fault or magma) and to confirm that there was not the trace that the phenomena occurred in the past and to predict/evaluate possibility of the phenomena, development of the research/prediction techniques will be carried out. Concerning active fault and seismic activity, information maintenance for research of an activity history and distribution of an active fault (movement, extension, development process of a deformation zone) will be carried out. For volcanological and geothermal studies, we are planning to examine a technique for detecting crustal magma and/or geothermal fluid in deep underground using geophysical and geochemical data, and models assessing the likelihood of future volcanism and its influence on geological environment. Concerning uplift, denudation, climatic change and sea-level change, making of concept model for landform development will be carried out.

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