Yasuko Miyakura², *Kazuyoshi Moriya¹, Akiko S. Goto³, Takashi Hasegawa³ (1.Department of Earth Sciences, Faculty of Education and Integrated Arts and Sciences, Waseda University, 2.Department of Earth Sciences,Resources and Environmental Engineering, Graduate School of Creative Science and Engineering, Waseda University, 3.Faculty of Earth Science and Civil Engineering, Institute of Science and Engineering, Kanazawa University)