Japan Geoscience Union Meeting 2016

Presentation information

Print

Oral

Symbol S (Solid Earth Sciences) » S-CG Complex & General

[S-CG60] Crustal fluids and deformation

Tue. May 24, 2016 10:45 AM - 12:15 PM A05 (APA HOTEL&RESORT TOKYO BAY MAKUHARI)

Convener:*Naoji Koizumi(School of Environmental Science,the University of Shiga Prefecture), Koji Umeda(Tono Geoscience Center,Japan Atomic Energy Agency), Norio Matsumoto(Tectono-Hydrology Research Group, Geological Survey of Japan, National Institute of Advanced Industrial Science and Technology (AIST)), Hidemi Tanaka(School of Science, The University of Tokyo), Kohei Kazahaya(Geological Survey of Japan, AIST), Fumiaki Tsunomori(Geochemical Research Center, Graduate School of Science, University of Tokyo), Chair:Naoji Koizumi(School of Environmental Science,the University of Shiga Prefecture), Fumiaki Tsunomori(Geochemical Research Center, Graduate School of Science, University of Tokyo)

11:30 AM - 11:45 AM

[SCG60-04] Estimate of hydraulic properties of the crust - An example from water discharge by Naganoken-Hokubu earthquake

*Hidemi Tanaka1, Kuo-Fong Ma2, Tsutomu Sato3, Fumiaki Tsunomori1, Norio Matsumoto3, Koji Umeda5, Kohei Kazahaya3, Kazunori Fujisawa4, Fumitake Kusuhara1 (1.School of Science, The University of Tokyo, 2.nstitute of Geophysics, National Central University, Taiwan, ROC Institute of Geophysics, National Central University, Taiwan, ROC, 3.Geological Survey, AIST, 4.Graduate school of Agriculture, Kyoto University, 5.Tono Geoscience center JAEA)

Keywords:Naganoken-Hokubu earthquake, Kamishiro Fault, Fluid discharge, Fracture zone, Hydroraulic property

On November 28, An M 6.7 earthquake occurred at northern part of Nagano Prefecture, Central Japan. The Kamishiro Fault,which has been well known as to be a part of Itoigawa-Shizuoka Tectonic Line, was activated by the earthquake and surface rupture about 9 km in length was appeared along it’s trace.
Post-seismic fluid discharge was observed from the fracture zone of the Kamishiro Fault. Our team has been observed and monitored the flow amount and chemical characteristics of the fluid for about 5 months from one week after the earthquake.
In this presentation, we describe the occurence of earthquakes and its relation to the hydraulic propertes and discuss about the governing equations of fluid flow in fracture zone ofthe Kamishiro Fault.