*Naoya Takahashi¹, Tadahiro Hayasaka¹ (1.Center for Atmospheric and Oceanic Studies, Graduate School of Science, Tohoku University,)

*Naoya Takahashi¹, Shinji Toda² (1.Graduate school of Science, Department of Earth Science, Tohoku University, 2.International Research Institute of Disaster Science, Tohoku University)

*Daisuke Ishimura¹, Hiroyuki Tsutsumi², Naoya Takahashi³, Ryuhei Oda¹, Jun Matsukaze¹, Heitaro Kaneda⁴, Motoya Kobayashi⁴, Yasuhiro Kumahara⁵, Makoto Kobayashi⁶, Toshihiko Ichihara⁷ (1.Department of Geography, Tokyo Metropolitan University, 2.Department of Environmental Systems Science, Faculty of Science and Engineering, Doshisha University, 3.Department of EarthScience, Tohoku University, 4.Graduate School of Science, Chiba University, 5.Graduate School of Education, Hiroshima University, 6.Research Center for Volcanic Hazards and Their Mitigation, Tokyo Metropolitan University, 7.Sedimentary Environments Research)