School of Earth and Environmental Sciences, Seoul National University, Sillim-dong, Gwanak-gu, Seoul, 151-747 Korea, Republic of
Earthquake Research Center, Geological and Environmental Hazards Division, Korea Institute of Geoscience and Mineral Resources, Gajeong-dong, Yuseong-gu, Daejeon, 305-350 Korea, Republic of
School of Earth and Environmental Sciences, Seoul National University, Sillim-dong, Gwanak-gu, Seoul, 151-747 Korea, Republic of