*Masayuki Maki¹, Takaaki Nishi², Tsuyoshi Nakatani¹, Yura Kim¹, Takehiko Kopbori³, Hidehiko Tokushima⁴, Yasushi Fujiyoshi⁵, Takeshi Tameguri⁶, Masato Iguchi⁶, Kanji Endo⁷, Kazuhiko Kaiga⁷ (1.Research and Education Center for Natural Hazards, Kagoshima University, 2.Faculty of Fisheries, Kagoshima University, 3.Graduate School of Science and Engineering, Kagoshima University, 4.Field Researchers corporation, 5.Emeritus Professor, Hokkaido University, 6.Disaster Prevention Research Institute, Kyoto University, 7.Koden Electronics Co., Ltd.)