*Yoshiharu Hirayama¹, Haruhisa Nakamichi², Yoshio Nakajima³, Yoichiro Naito³, Toshiharu Ikeda¹, Hiroshi Ando¹, Keiji Takeuchi¹ (1.Hakusan Corporation, 2.Sakurajima Volcano Research Center, Disaster Prevention Research Institute, Kyoto University, 3.Tokyo Power Technology Ltd.)

*Hiroyuki Fujiwara¹, Yoshiharu Hirayama², Minoru Yoshida², Shigeki Horiuchi³, Yoshio Nakajima⁴, Tsutomu Yamate² (1.National Research Institute for Earth Science and Disaster Resilience, 2.Hakusan Corpration, 3.Home Seismometer Co. Ltd., 4.Tokyo Power Technology Ltd.)

*Makoto OKUBO^1,5, Hirotaka Takahashi⁵, Akito Araya³, Satoshi Itaba², Masaki Kanao⁴ (1.Natural Science Cluster, Kochi University, 2.National Institute of Advanced Industrial Science and Technology, 3.Earthquake Research Institute, University of Tokyo, 4.National Institute of Polar Research, 5.Tokyo City University)

*Tadashi Yamashina¹, Makoto OKUBO¹, Nobuyuki Yamada¹, Takao Tabei¹ (1.Kochi University)

*Shoji Sekiguchi¹ (1.National Research Institute for Earth Science and Disaster Resilience)

*Mongkolchai Sukmee¹, Hiroyuki Kumagai¹ (1.Graduate School of Environmental Studies, Nagoya University, Furo-cho, Chikusa-ku, Nagoya 464 8601, Japan)

*Shinji SATO¹, Kunihiro KAWASAKI¹ (1.Railway Technical Research Institute)