Affiliation: | National Research Institute for Earth Science and Disaster Prevention, 3-1;Tennodai, Tsukuba 305-0006, Japan. E-mail: Research Center for Prediction of Earthquakes and Volcanic Eruptions, Graduate School of Science, Tohoku University, 6-6;Aza-Aoba, Aramaki, Aoba-ku, Sendai 980-8578, Japan Hot Spring Research Institute of Kanagawa Prefecture, 586;Iryuda, Odawara 205-0031, Japan |