Miyuki Mori¹, *Masaya Yasuhara¹, Seongwon Lee¹, Yuri Hirano¹, Fumitake Kusuhara², Noritoshi Morikawa³, Kohei Kazahaya³ (1.Rissho Univ., 2.Central Research Institute of Electric Power Industry, 3.Geological Survey of Japan, AIST)