*Gaku Kimura¹, Tadao Nishiyama², Sho Sasaki³, Rie Hori, S.⁴ (1.Tokyo University of Marine Science and Technology, 2.Kumamoto University, 3.Osaka University, 4.Ehime University)

*Hiroo Nemoto¹, *Norihiko Kobayashi², Seiichiro Yamamoto³, Yasushi Fujiwara⁴, Shinichi Kawate⁵, Yasuhiro Taguchi⁶, Takayuki Ogata⁷, Satoshi Miyajima⁸, Masatsune Hatakeyama⁹, Sho Sasaki¹⁰ (1.Division of Natural Sciences, J. F. Oberlin University, 2.Seibu Gakuen Bunri Secondary School, 3.Fukui Prefectural Fukui Commercial Upper Secondary School, 4.Evening Classes; Integrated Course, Kanagawa Prefectural Mukaino’oka Technical Upper Secondary School, 5.Musashi Secondary School, 6.Chiba Prefectural Choushi Upper Secondary School, 7.Disaster Prevention Research Center for Island Regions, University of the Ryukyus, 8.Saitama Prefectural Kumagaya Upper Secondary School, 9.Seikou Gakuin Secondary School, 10.Department of Earth and Space Sciences, School of Science, Osaka University)

*Seiichiro Yamamoto¹, *Norihiko Kobayashi², Takayuki Ogata³ (1.Fukui Commercial High School, 2.Seibu Gakuen Bunri Secondary School, 3.Disaster Prevention Research Center for Island Regions, University of the Ryukyus)

*Takayuki Ogata¹ (1.Disaster Prevention Research Center for Island Regions, University of the Ryukyus)