Sediment]related disasters induced by the Kumamoto Earthquake in April 2016

Yoshiharu ISHIKAWA, Tetsuya KUBOTA, Kazutaka AOTO, Yasuo IJIMA, Toshiyuki IKAWA, Tadashi IKEGAMI, Makoto IKEDA, Hirotaka UE, Yuuji UEHARA, Yuichi UCHIMURA, Kanae EGAWA, Hiroyuki OHISHI, Kazuyuki OKANO, Masahiro KAIBORI, Shinya KATSURA, Nobuaki KATO, Shinichiro KAWAHARA, Syozo KOGA, Toshihiko SAKASHIMA, Wataru SAGARA, Takashi JITOUSONO, Yoshinori SHINOHARA, Osamu SHIMIZU, Yoshifumi SHIMODA, Shigeru SUZUKI, Masami SUZUKI, Kohei SETO, Satoshi TAGATA, Hideki TERADA, Yukiyoshi TERAMOTO, Masamitsu DOUNOWAKI, Satoshi TOBIOKA, Eiji TORITA, Koji NAKANO, Tomoaki NISHIKAWA, Ryouta HANADA, Yasuyuki HIRAKAWA, Kozaburou FUKUZUKA, Yasuhiro FUJISAWA, Masaharu FUJITA, Kouichi MASAKI, Naoki MIYATA, Kazuya YAMAGUCHI, Shintaro YAMASHITA, Makoto YAMANE, Kimihiro YOKOO

The landslides on April 16th 2016 in Kumamoto prefecture, especially in the Aso volcanic range, with intense earthquake of M 7.3 (maximum acceleration=1,791gal) yielded countless instances of landslide and debris flow that induced tremendous damages and causalities in the area. Hence, field investigation and reconnaissance were conducted by the Japan Society of Erosion Control Engineering to delve into this sediment]related disasters. The various results and the information containing phenomena of slope movements, obtained through this investigation were reported as the primary report, mentioning damage, geologic]geomorphologic features and geo]technical characteristics of the landslides, vegetation effects on the slope instability phenomena, possibility of occurrence of secondary disasters, urgent measures for mitigating secondary disasters, and the efficiency of Sabo facilities in this disaster.