2013 Fiscal Year Final Research Report
Electromagnetic Imaging of Geofluid
| Project Area | Geofluids: Nature and dynamics of fluids in subduction zones |
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| Project/Area Number |
21109003
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| Research Category |
Grant-in-Aid for Scientific Research on Innovative Areas (Research in a proposed research area)
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| Allocation Type | Single-year Grants |
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| Review Section |
Science and Engineering
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| Research Institution | Tokyo Institute of Technology |
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Principal Investigator |
OGAWA Yasuo 東京工業大学, 火山流体研究センター, 教授 (10334525)
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| Co-Investigator(Kenkyū-buntansha) |
FUJITA Kiyoshi 大阪大学, 工学系研究科, 教授 (00283862)
KANDA Wataru 東京工業大学, 火山流体研究センター, 准教授 (00301755)
MATSUSHIMA Masaki 東京工業大学, 理工学研究科, 助教 (20242266)
YOSHINO Takashi 岡山大学, 地球物質科学研究センター, 准教授 (30423338)
TOH Hiroaki 京都大学, 理学研究科, 准教授 (40207519)
UYESHIMA Makoto 東京大学, 地震研究所, 准教授 (70242154)
ICHIKI Masahiro 東北大学, 理学研究科, 助授 (80359182)
KOYAMA Takao 東京大学, 地震研究所, 助授 (00359192)
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| Project Period (FY) |
2009-07-23 – 2014-03-31
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| Keywords | 比抵抗 / 流体 / 高温高圧岩石実験 / MT観測 |
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| Research Abstract |
From the detailed magnetotelluric observations around the Naruko volcano in the central NE Japan arc, we analyzed three-dimensional resistivity structure of the crust and the upper mantle. We found sub-vertical conductors beneath active volcanoes, Naruko and Onikobe, which imply existence of saline fluid reservoir. In the upper mantle, we imaged a conductor on top of the down-going plate. The conductor extends towards the Moho under the backbone ranges. We also found that it also has a branch toward west beneath volcanoes along the Japan Sea. From the experimental resistivity measurements of a fluid bearing rocks under lower crustal conditions, we found that those crustal conductors, found by magnetotelluric measurements, need high salinity fluids.
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[Journal Article] Three- dimensional resistivity structure and magma plumbing system of the Kirishima volcanoes as inferred from broad-band magnetotelluric data2014
Author(s)
Aizawa, K., T.Koyama, H.Hase, M.Uyeshima, W.Kanda, M.Utsusgi, R.Yoshimura, Y.Yamaya, T.Hashimoto, K.Yamazaki, S.Komatsu, A.Watanabe, K.Miyakawa, Y.Ogawa
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Journal Title
J. Geophys. Res.
Volume: 119
DOI
Peer Reviewed
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[Journal Article] A fault-zone conductor beneath a compressional inversion zone, northeastern Honshu, Japan2011
Author(s)
Ichihara, H., M.Uyeshima, S.Sakanaka, T.Ogawa, M.Mishina, Y.Ogawa, T.Nishitani, Y.Yamaya, A.Watanabe, Y.Morita, R.Yoshimura, Y.Usui
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Journal Title
Geophys. Res. Lett.
Volume: 38
Pages: L09301
DOI
Peer Reviewed
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[Journal Article] The fluid and deformation regime of an advancing subduction system ; Marlborough2009
Author(s)
Wannamaker, P.E., T.G.Caldwell, G.R.Jiracek, V.Maris, G.J.Hill, Y.Ogawa, H.M.Bibby, S.B.Bennie, and W.Heise
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Journal Title
New Zealand, Nature
Volume: 460
Pages: 733-U90
DOI
Peer Reviewed
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