VolNop 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 Abstract The landslides on April 16 th 2016 in Kumamoto prefecture, especially in the Aso volcanic range, with intense earthquake of M 7.3 (maximum acceleration=1,791 gal) 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. Key words 2016 Kumamoto Earthquake, landslide, debris flow, sediment-related disaster, secondary disaster M M Member, Tokyo University of Agriculture and Technology Member, Kyushu University Member, Kokusai Kogyo Co., Ltd. Member, Yachiyo Engineering Co., Ltd. Member, Oyo Co., Ltd. Member, Sabo Engineering Co., Ltd. Member, West Japan Engineering Consultants, Inc. Member, Asia Air Survey Co., Ltd. Member, Hiroshima University Member, Hokkaido University Member, Sabo and Landslide Technical Center Member, Nippon Koei Co., Ltd. Member, Pacific Consultants Co., Ltd. Member, Kagoshima University (saboj@agri.kagoshima-u.ac.jp) Member, University of Miyazaki Member, Japan Conservation Engineers & Co., Ltd. Member, Toa consultant Co., Ltd. Member, Kyoto University Member, CTI Engineering Co., Ltd.
NE km M NE km M gal gal gal gal gal gal gal cm http //www.jishin.go.jp/ Vol NoSeptember
m km km NoNo No No JR
Vol NoSeptember KML km ha km a m m b m m c m m
d m JR LP JR haha ha ha m m m LP m m LP m m m LP m
Vol NoSeptember m m m m m cmcm
LP H H m DEM mm m m m m m
Vol NoSeptember EC ms m m km mm m Lm mmmm m m m Y m m m m
m m m m s mm mm HH m m mm m m m m m mm/day mm/hr H H H H H H SH mm m mm m m m tanα α
Vol NoSeptember LP km mm m m m m m km mm m m m m m m mcm m m s m mmm
m mm m cm mcm m mm m m mm mmm m m m m m mm m
Vol NoSeptember m m m m cm m m m m M N O P M P mm 2016 28 KML http://www.gsi.go.jp/bousai/h27 kumamoto-earthquake -index.html 2016 06 10 2012 24 7 Vol 65 No 4 p 50 61 2016 http : //www.bousai.go. jp/updates/h 280414 jishin/index.html 2016 06 08 1985