Paleoseismic investigations of the Hinagu fault zone, Kumamoto, Japan: Preliminary result of trenching survey at Yatsushiro city

Yukari Miyashita; Takashi Azuma; Yusuke Komine; Masao Kametaka; Midori Kishiyama

Presentation information

[J] Oral

S (Solid Earth Sciences ) » S-SS Seismology

[S-SS15] Active faults and paleoseismology

Wed. May 29, 2019 1:45 PM - 3:15 PM A02 (TOKYO BAY MAKUHARI HALL)

convener:Mamoru Koarai(Earth Science course, College of Science, Ibaraki University), Takashi OGAMI(National Institute of Advanced Industrial Science and Technology), Ryosuke Doke(Hot Springs Research Institute of Kanagawa Prefecture), Hisao Kondo(Geological Survey of Japan, National Institute of Advanced Industrial Science and Technology), Chairperson:Takashi Ogami(AIST), Koji Okumura(Hiroshima University)

2:15 PM - 2:30 PM

[SSS15-17] Paleoseismic investigations of the Hinagu fault zone, Kumamoto, Japan: Preliminary result of trenching survey at Yatsushiro city

*Yukari Miyashita¹, Takashi Azuma¹, Yusuke Komine², Masao Kametaka², Midori Kishiyama² (1.Institute of Earthquake and Volcano Geology, Geological Survey of Japan, National Institute of Advanced Industrial Science and Technology, 2.Dia Consultants Co. Ltd.)

Keywords:Hinagu fault zone, 2016 Kumamoto Earthquake, paleoseismology, trenching survey

We conducted paleoseismic investigations such as drilling and trenching surveys across the Hinagu segment of the Hinagu fault zone, Kumamoto, Japan. The result based on the careful trench wall observation and preliminary radiocarbon dating of sediments show that paleoearthquake cycle of the Hinagu segment is shorter than previous evaluation of the fault.