3:45 PM - 4:00 PM
*Koji Kameo1, Yuki Haneda2, Yoshimi Kubota3, Yusuke Suganuma4, Makoto Okada5 (1.Department of Earth Sciences, Faculty of Science, Chiba University, 2.Graduate School of Science and Engineering, Ibaraki University, 3.National Museum of Nature and Science, 4.National institute of Polar Research, 5.Department of Earth Sciences, Faculty of Science, Ibaraki University)