Yoshihiro Ito, Disaster Prevention Research Institute, Kyoto University, Kyoto, Japan, Miyuu Uemura, Pasadena, CA, United States, Spahr C Webb, Lamont Doherty Earth Observatory, Palisades, NY, United States, Kimihiro Mochizuki, University of Tokyo, Earthquake Research Institute, Bunkyo-ku, Japan and Stuart A Henrys, GNS Science, Lower Hutt, New Zealand