Institution: | 1. Geological Survey of Hokkaido, Environmental and Geological Research Department, Hokkaido Research Organization, N19 W12, Kita-ku, Sapporo, 060-0819, Japan 2. Institute for Geothermal Sciences, Graduate School of Science, Kyoto University, Noguchibaru 3088, Beppu, Oita, 874-0903, Japan
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