| 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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| Budget Amount *help |
¥168,220,000 (Direct Cost: ¥129,400,000、Indirect Cost: ¥38,820,000)
Fiscal Year 2013: ¥20,930,000 (Direct Cost: ¥16,100,000、Indirect Cost: ¥4,830,000)
Fiscal Year 2012: ¥31,070,000 (Direct Cost: ¥23,900,000、Indirect Cost: ¥7,170,000)
Fiscal Year 2011: ¥41,210,000 (Direct Cost: ¥31,700,000、Indirect Cost: ¥9,510,000)
Fiscal Year 2010: ¥34,190,000 (Direct Cost: ¥26,300,000、Indirect Cost: ¥7,890,000)
Fiscal Year 2009: ¥40,820,000 (Direct Cost: ¥31,400,000、Indirect Cost: ¥9,420,000)
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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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