JpGU-AGU Joint Meeting 2017

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[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)

10:45 AM - 11:00 AM

[HCG37-11] Earthquake faults along the Kiyomasa-kodo and in the northwestern part of the Aso caldera during 2016 Kumamoto Earthquake

*Mitsuhisa Watanabe1, Takashi Nakata2, Hideaki Goto3, Kei Tanaka4, Yasuhiro Suzuki5, Keita Takada6 (1.Faculty of Sociology, Toyo University, 2.Emeritus professor, Hiroshima University, 3.Graduate school of letters, Hiroshima University, 4.Japan Map Center, 5.Nagoya University, 6.Fukken Co. Ltd.)

Keywords:earthquake fault, right-latera fault, normal fault, Kiyomasa-kodo, Aso caldera, 2016 Kumamoto earthquake

A large number of ruptures appeared along the Futaenotoge seismic zone and its extension during 2016 Kumamoto earthquake. There are right-lateral earthquake faults along the Kiyomasa-kodo (Seishoko-do). The narrow “severely damaged zone” indicates that the upper cutoff depth of seismogenic layer is very shallow. The remarkable surface ruptures aligned in ENE-WSW direction intermittently in the northwestern part of the Aso caldera. The locations of the ruptures are not coincided in space with soft grounds, and strong tremor did not attack the areas. The tectonic ruptures in the form of grabens caused the lateral ground displacements in these areas.