Institution: | National Research Center for Disaster Prevention, Tennodai 3–1, Sakura-mura, Niihari-gun, Ibaraki-ken 305, Japan;Department of Earth Sciences, Nagoya University, Chikusa, Nagoya 464, Japan;National Research Center for Disaster Prevention, Tennodai 3–1, Sakura-mura, Niihari-gun, Ibaraki-ken 305, Japan |