Affiliation: | 1. Department of Physics, Faculty of Science, Tokyo University of Science, 1-3 Kagurazaka, Shinjuku-ku, Tokyo, 162-8601, Japan;2. Department of Earth and Planetary Sciences, Faculty of Science, Kobe University, Nada-ku, Kobe 657-8501, Japan;3. Department of Geoenvironmental Sciences, Graduate School of Science, Tohoku University, 6-3, Aoba-ku, Sendai 980-8578, Japan |