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Matsuoka, Toshiyuki; Yamanaka, Yoshiaki; Asamori, Koichi; Amano, Kenji; Niizato, Tadafumi; Ota, Kunio; Shigeta, Naotaka; Marui, Atsunao*; Uchida, Toshihiro*
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no abstracts in English
Ota, Kunio; Shigeta, Naotaka; Marui, Atsunao*; Uchida, Toshihiro*; Kiho, Kenzo*; Hasegawa, Takuma*
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JAEA commenced a surface-based investigation programme under the collaboration with AIST and CRIEPI, which would focus on the establishment of comprehensive site characterisation technology and the enhancement of its reliability through the characterisation of the geological environment at the coastal region in Horonobe, Hokkaido. Here the programme, particularly background, goal, main issues and timeplan, is overviewed.
Motoyama, Aoi*; Ogawa, Yasuo*; Uyeshima, Makoto*; Asamori, Koichi; Uchida, Toshihiro*; Hase, Hideaki*; Koyama, Takao*; Sakanaka, Shinya*; Yamaya, Yusuke*; Aizawa, Koki*; et al.
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no abstracts in English
Motoyama, Aoi*; Ichiki, Masahiro*; Ogawa, Yasuo*; Uyeshima, Makoto*; Asamori, Koichi; Uchida, Toshihiro*; Koyama, Takao*; Sakanaka, Shinya*; Hase, Hideaki*; Aizawa, Koki*; et al.
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We compiled the magnetotelluric (MT) and geomagnetic transfer function (GDS) data which were acquired by Uchida (2004), Umeda et al. (2008), Asamori et al. (2011), Uyeshima (private comm.) and Ogawa (private comm). The 118 observation sites locate in the study area. Both MT and GDS frequency response was used to model three-dimensional resistivity distribution of the southern Tohoku district, NE Japan. The resultant resistivity model reveals no conductor beneath the onshore forearc in Fukushima prefecture. The model rather shows resistor there with over several-thousand ohm-m, which corresponds to the Abukuma batholiths. Thus, our model indicates that the area only around Iwaki-city is peculiar forearc, where fluid migrates upward from deep crust.