Subsurface geological mapping of the Japanese islands

Yasue, Kenichi; Ishimaru, Tsuneari ; Kobori, Kazuo; Umeda, Koji; Nakatsuka, Noboru

From the viewpoint of present and future use of underground space such as the geological disposal of radioactive waste and carbon dioxide, this is a need to understand subsurface geological structures in the Japanese islands. In general, conventional methods of subsurface mapping are widely used to convert subsurface geological information into two-dimensional space. We present subsurface geological structures on horizontal-section maps at depths of 0, 500, and 1,000 meters below sea level. We also map surface geological units consisting of pre-Neogene basement rocks. Data from existing geological maps, geological cross sections and boreholes were used as input to the maps. The data has been gathered from publications prior to 2001.