*Yusuke Tomozawa¹, Shin-ichi Onodera¹, Mitsuyo Saito², Tohru TAKEUCHI³, Yutaka MARUYAMA, Koichi Kitaoka⁴ (1.Graduate School of Integrated Arts and Sciences Hiroshima University, 2.Graduate School of Environmental and Life Science, Okayama University, 3.Fujita Geology Co., Ltd., 4.Okayama University of Scienece)