JpGU-AGU Joint Meeting 2017

Presentation information

[JJ] Oral

H (Human Geosciences) » H-CG Complex & General

[H-CG37] [JJ] Active fault and disaster mitigation learned from 2016 Kumamoto earthquake

Sun. May 21, 2017 10:45 AM - 12:15 PM A02 (Tokyo Bay Makuhari Hall)

convener:Yasuhiro Suzuki(Nagoya University), Hiroyuki Fujiwara(National Research Institute for Earth Science and Disaster Prevention), Yoshiaki Hisada(Kogakuin University, School of Architecture), Toshitaka Kamai(Disaster Prevension Research Institute, Kyoto University), Chairperson:Yoshiaki Hisada(Kogakuin University, School of Architecture), Chairperson:Yasuhiro Suzuki(Nagoya University)

11:30 AM - 11:45 AM

[HCG37-14] Geometry of surface fault ruptures of the 2016 Kumamoto earthquake and house damages

*Takashi Nakata1 (1.Hiroshima University)

Keywords:Kumamoto earthquake, fault geometry, house damage

During the Kumamoto earthquake (Mw 7.3) on April 16, 2016 severe house damages were caused by the strong shaking and surface fault rupture along active fault known as the Futagawa-Hinagu fault in central Kyushu, southwest Japan and near-by faults some of which were not known before. Main surface fault ruptures with right-lateral slip appeared along northern part of the Futagawa-Hinagu
Severe house damages appeared in narrow zones several hundred meters from the surface fault traces, and destructive house damages were unevenly distributed and concentrated in the both ends of the main surface fault rupture as observed Mashiki town and Minami-Aso village. Along the main surface fault rupture sever house damages were locally concentrated in the places where surface fault ruptures make steps and bends, while house damages were relatively small along the areas where surface fault ruptures extends straight except for the damages on the fault traces. House damages along the surface fault ruptures with normal slip were rather small suggesting that ground shaking was not so strong.