1. The Interdisciplinary Graduate School of Science and Engineering, Tokyo Institute of Technology, 4259 Nagatsuta, Midori-ku, Yokohama, Kanagawa 226-8502, Japan.
2. Corresponding author.
3. Earthquake Research Institute, University of Tokyo, 1-1-1 Yayoi, Bunkyo-ku, Tokyo 113-0032, Japan.
4. Faculty of Civil and Environment Engineering, Institut Teknologi Bandung, Jalan Ganesha no. 10, Bandung 40132, Indonesia.
5. Faculty of Earth Science and Technology, Institut Teknologi Bandung, Jalan Ganesha no. 10, Bandung 40132, Indonesia.