Oral

Symbol S (Solid Earth Sciences) » S-IT Science of the Earth's Interior & Techtonophysics

[S-IT40_1AM1] Geofluids: their distribution and role in the Earth's dynamics

Thu. May 1, 2014 9:15 AM - 10:45 AM 416 (4F)

Convener:*Michihiko Nakamura(Division of Earth and Planetary Materials Science, Department of Earth Science, Graduate School of Science, Tohoku University), Hiroshi Sakuma(Department of Earth and Planetary Sciences, Graduate School of Science and Engineering, Tokyo Institute of Technology), Masahiro Ichiki(Graduate School of Science, Tohoku University), Tsutomu Takahashi(Institute for Research on Earth Evolution Japan Agency for Marine-Earth Science and Technology), Chair:Masahiro Ichiki(Graduate School of Science, Tohoku University), Hiroshi Sakuma(National Institute for Materials Science)

Recent advances of magnetotelluric and seismic imaging of the Earth's interior have suggested "geofluids" distribute more ubiquitously than ever thought; this has accelerated the development of a new integrated discipline on the geofluids ranging from material sciences in molecular scale to geophysics and geochemistry in the island arcs and mid oceanic ridges. The scope of this session is to bring together multi-scale and interdisciplinary researches on distributions of aqueous fluids and silicate and other melts in the crust and mantle of a wide range of tectonic settings, and on the physical and chemical properties of these fluids. Topics on geodynamics related to the presence of fluids are also welcomed.

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9:15 AM - 9:30 AM

[SIT40-01] 3D imaging of geofluid by wideband magnetotellurics

*Yasuo OGAWA¹, Masahiro ICHIKI², Wataru KANDA¹ (1.Volcanic Fluid Research Center, Tokyo Institute of Technology, 2.Graduate School of Science, Tohoku University)

9:30 AM - 9:45 AM

[SIT40-02] Three dimensional electrical conductivity model in the subduction zone beneath northeastern Japan

*Masahiro ICHIKI¹, Yasuo OGAWA², Toshiki KAIDA¹, Tomotsugu DEMACHI¹, Satoshi HIRAHARA¹, Yoshimori HONKURA², Hiroshi ICHIHARA³, Wataru KANDA², Toshio KONO¹, Takao KOYAMA⁴, Masaki MATSUSHIMA⁵, Takashi NAKAYAMA¹, Shu'ichi SUZUKI¹, Hiroaki TOH⁶, Makoto UYESHIMA⁴ (1.Grad. School of Sci., Tohoku University, 2.VFRC, Tokyo Institute of Technology, 3.IFREE, JAMSTEC, 4.ERI, The University of Tokyo, 5.Grad. School of Sci. & Eng., Tokyo Tech, 6.Grad. School of Sci., Kyoto University)

9:45 AM - 10:00 AM

[SIT40-03] S-wave attenuation on the western side of Nankai subduction zone: implications for geofluid distribution and dynamics

*Tsutomu TAKAHASHI¹, Koichiro OBANA¹, Yojiro YAMAMOTO¹, Ayako NAKANISHI¹, Shuichi KODAIRA¹, Yoshiyuki KANEDA¹ (1.JAMSTEC)

10:00 AM - 10:15 AM

[SIT40-04] Seismic activity near the Moriyoshi-zan volcano in northeastern Japan: Implications for geofluid migration

*Masahiro KOSUGA¹ (1.Graduate School of Science and Technology)

10:15 AM - 10:30 AM

[SIT40-05] Is H₂O-NaCl fluid enough to explain high electrical conductivity in the earth's crust?

*Hiroshi SAKUMA¹, Masahiro ICHIKI² (1.National Institute for Materials Science, 2.Tohoku University)

10:30 AM - 10:45 AM

[SIT40-06] Connectivity of cracks and pores in a granitic rock

*Tohru WATANABE¹, Akiyoshi HIGUCHI¹, Akira YONEDA² (1.Graduate school of science and engineering, University of Toyama, 2.Institute for Study of Earth's Interior, Okayama University)