Japan Geoscience Union Meeting 2015

Presentation information


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

[S-CG61] Crustal fluids and deformation

Wed. May 27, 2015 6:15 PM - 7:30 PM Convention Hall (2F)

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)

6:15 PM - 7:30 PM

[SCG61-P01] Coseismic discharge of hot spring water due to the 2014 Northern Nagano earthquake

*Tsutomu SATO1, Tadafumi OCHI1, Masaaki TAKAHASHI1, Norio MATSUMOTO1, Kohei KAZAHAYA1, Hiroshi TAKAHASHI1, Akihiko INAMURA1, Hiroko HANDA1, Noritoshi MORIKAWA1, Atsuko NAKAMA1 (1.Geological Survey of Japan, AIST)

Keywords:the 2014 Northern Nagano earthquake, hot spring water discharge, coseismic hydrological change

On November 22, 2014, the Mw6.2 (Mj6.7) earthquake occurred in the northern part of Nagano Prefecture. Next morning, an anomalous discharge of hot spring water and gas was found in 8 km north of the epicenter. As the result of our survey on December 2, the water temperature was 26.4 degree-C, and the flow rate was 75 L/min. The major chemical composition of hot spring water and gas were sodium bicarbonate and methane, respectively.