convener:Koji Okumura(Graduate School of Letters, Hiroshima University), Jun Matsumoto(Deaprtment of Geography, Tokyo Metropolitan University), Daisaku Kawabata(Institute of Geology and Geoinformation, Geological Survey of Japan, AIST), Masaki Matsushima(Department of Earth and Planetary Sciences, School of Science, Tokyo Institute of Technology), Chairperson:Daisaku Kawabata, Koji Okumura(Hiroshima University)