1. BK21 School of Earth and Environmental Systems, Pusan National University, 2 Busandaehak-ro 63 beon-gil, Busan 46241, Korea
2. Marine Geology and Geophysical Exploration Research Center, Korean Institute of Geoscience and Mineral Resources, 124 Gwahak-ro, Daejeon 34132, Korea
3. Quaternary Environment Research Center, Korean Institute of Geoscience and Mineral Resources, 124 Gwahak-ro, Daejeon 34132, Korea
4. Department of Geology, Kangwon National University, 1 Gwangwondaehak-gil, Chuncheon 24341, Korea
5. Department of Oceanography, Pusan National University, 2 Busandaehak-ro 63 beon-gil, Busan 46241, Korea (e-mail: )