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Geological map of the study area. The location of the accretionary prism known as the Shimanto Belt in southwest Japan is according to Kano et al. (27). The geological map of Shizuoka Prefecture, Japan, is modified from the 1:200,000 seamless digital geological map of Japan (14). The circles indicate the locations of the wells used for sampling. MTL, Median Tectonic Line; ISTL, Itoigawa-Shizuoka Tectonic Line.
