Annual report for research on long-term stability of geological environment in FY2006
Nohara, Tsuyoshi ; Umeda, Koji; Sasao, Eiji ; Hanamuro, Takahiro ; Saito, Tatsuo ; Yasue, Kenichi; Niwa, Masakazu ; Mashima, Hidehisa*; Shimada, Koji ; Yamada, Kunimi; Ninomiya, Atsushi; Negi, Tateyuki; Tajikara, Masayoshi; Kamataki, Takanobu*; Kusano, Tomohiro; Nakatsuka, Noboru
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 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, we carried out the following researches, to confirm existence of the phenomena that have influences on geological disposal system, and to develop the research techniques to reconstruct the history of these phenomena. For studies of active faulting and seismic activity, we reviewed the existing techniques to research past activities and distribution of active faults (migration, extension, development process of a deformation zone). For volcanological and geothermal studies, we extracted 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. For studies of uplift/denudation and climatic/sea-level change, we constructed conceptual models such as landform development model.