Japan Geoscience Union Meeting 2015

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

[S-CG61] Crustal fluids and deformation

Wed. May 27, 2015 11:00 AM - 12:45 PM 102B (1F)

Convener:*Naoji Koizumi(Geological Survey of Japan, National Institute of Advanced Industrial Science and Technology), 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(Laboratory for Earthquake Chemistry, Graduate School of Science, University of Tokyo), Chair:Naoji Koizumi(Geological Survey of Japan, National Institute of Advanced Industrial Science and Technology), Koji Umeda(Tono Geoscience Center,Japan Atomic Energy Agency)

12:15 PM - 12:30 PM

[SCG61-06] Observation of co- and post-seismic fluid migration in and around Kamishiro Fault, Naganoken-Hokubu earthquake

*Hidemi TANAKA1, Reaerch group GEOFLUID1 (1.Hidemi Tanaka)

Keywords:Naganoken-Hokubu earthquake, Kamishiro Fault, Fluid, Hot spring, Fracture zone, hydrological characteristics

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 with about 9 km in length was appeared along it's trace.

Right before and after the earthquake, pre-, co- and post-seismic fluid migration was observed at around the Kamishiro Fault. Our team has been observing and monitoring the flow amount and chemical characteristics of the fluid from one week after the earthquake to present and still continue observation.

In this presentation, we consider the driving mechanism for fluid flow and hydrological characteristics of the fracture zone of the Kamishiro Fault.