1. Institute of Industrial Science, The University of Tokyo, 4‐6‐1 Komaba, Meguro‐ku, Tokyo 153‐8505, Japan, omi@sat.t.u-tokyo.ac.jp, aihara@sat.t.u-tokyo.ac.jp
2. The Institute of Statistical Mathematics, 10‐3 Midori‐cho, Tachikawa, Tokyo 190‐8562, Japan, ogata@ism.ac.jp
3. National Research Institute for Earth Science and Disaster Resilience, 3‐1 Tennodai, Tsukuba, Ibaraki 305‐0006, Japan, shiomi@bosai.go.jp, sawa@bosai.go.jp
4. Department of Geophysics, Graduate School of Science, Kyoto University, Kitashirakawa Oiwake‐cho, Sakyo‐ku, Kyoto 606‐8502, Japan, benescu@kugi.kyoto-u.ac.jp