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Tokiwa, Tetsuya; Asamori, Koichi; Hiraga, Naoto*; Yamada, Osamu; Moriya, Hirokazu*; Hotta, Hikaru*; Kitamura, Itaru*; Yokota, Hideharu
Proceedings of 13th International Conference on Environmental Remediation and Radioactive Waste Management (ICEM 2010) (CD-ROM), p.117 - 122, 2010/10
In this paper, we discuss the relationship between the accurate hypocentral distribution and 3-D geological structure in and around the Horonobe area, Japan. We carried out multiplet-clustering analysis by using data of the 421 micro-earthquakes which occurred from 1st September, 2003 to 30th September, 2007. The 3-D geological structure model was mainly constructed from previous seismic reflection profiles and drilling data. As a result of this analysis, although there are some differences in depth between them, the hypocenters are distributed in NNW-SSE direction and become deeper from the west toward the east. The distributed pattern of the hypocenters is similar to the one of the geological structure. These results indicate that the hypocentral distribution may represent existence of active zone related to the geological structure, and provide effective information which can contribute to establishing methods for estimating the future evolution of the geological environment.
Sano, Michiaki; Ishii, Eiichi; Niinuma, Hiroaki; Fujikawa, Daisuke; Sanada, Hiroyuki; Hiraga, Naoto; Tsusaka, Kimikazu; Yamasaki, Masanao*
JAEA-Data/Code 2009-015, 142 Pages, 2009/11
JAEA-Data-Code-2009-015.pdf:41.84MB
In the Horonobe Underground Laboratory (URL) Project, Construction of the Ventilation Shaft, the East Shaft and the drifts has been conducted as a Phase 2 research. In the research, observation of the lithofacies and fracture, and in-situ tests, simple elastic wave exploration, Schmidt hammer test, Equotip test, point load test are conducted in each face, and measuring instruments such as extensometer, rock-bolt axial force meter, shotcrete stress meter and tunnel lining concrete stress meter are installed in particular face. In addition, for the purpose of the validation of the results of predictive analysis, conducted in Phase 1, about the amount of spring water during construction of Underground facilities, data on the changes of amount of spring water and water quality is obtained. This report summarizes the measurements data acquired at the Ventilation Shaft (GL -161m 
-250m), the East Shaft (GL -110m -140m) and the 140m drift.
Osawa, Hideaki; Ota, Kunio; Hama, Katsuhiro; Sawada, Atsushi; Takeuchi, Shinji; Amano, Kenji; Saegusa, Hiromitsu; Matsuoka, Toshiyuki; Miyamoto, Tetsuo; Toyoda, Gakuji; et al.
JAEA-Research 2008-085, 742 Pages, 2008/11
JAEA-Research-2008-085-1.pdf:26.22MBJAEA-Research-2008-085-2.pdf:16.64MBJAEA-Research-2008-085-3.pdf:28.27MB
This report shows the results the project for the establishment of comprehensive site characterization technology, entrusted from Natural Resources and Energy Agency, Ministry of Economy, Trade and Industry Natural Resources and Energy Agency in 2007.
Yamazaki, Masanao; Funaki, Hironori; Yamaguchi, Takehiro*; Niinuma, Hiroaki; Fujikawa, Daisuke; Sanada, Hiroyuki; Hiraga, Naoto; Tsusaka, Kimikazu
JAEA-Data/Code 2008-023, 136 Pages, 2008/11
JAEA-Data-Code-2008-023.pdf:17.08MB
This report summarizes the measurements data acquired at the Ventilation Shaft, the East Shaft and the drifts in 2007 based on the Observational Construction Program. The report summarizes for the purpose of the followings: sharing the investigation and measurements data, preventing the loss of them and acquisition the basic data for carrying out the Observational Construction Program.
Hiraga, Naoto; Ishii, Eiichi
JAEA-Data/Code 2007-022, 100 Pages, 2008/02
JAEA-Data-Code-2007-022.pdf:6.67MB
Geological Isolation Research and Development Directorate, Horonobe Underground Research Unit conducted following three analysis for the 1st phase of Horonobe Underground Research Laboratory Project. (1) Mineral composition analysis of core sample, (2) Whole rock chemical composition analysis of core sample, (3) Surface gas composition analysis. This document summarizes the results of these analysis. Keywords: Horonobe Underground Research Laboratory Project, Mineral composition, Chemical and isotopic composition, Surface gas composition.
Kunimaru, Takanori; Yamanaka, Yoshiaki; Ota, Kunio; Niizato, Tadafumi; Asamori, Koichi; Hiraga, Naoto; Matsuoka, Toshiyuki
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Ishii, Eiichi; Funaki, Hironori; Hiraga, Naoto
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Yamanaka, Yoshiaki; Hiraga, Naoto; Asamori, Koichi
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Ishii, Eiichi; Hiraga, Naoto; Yabuuchi, Satoshi; Yokota, Hideharu; Furusawa, Akira*
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Hiraga, Naoto; Ishii, Eiichi; Niinuma, Hiroaki
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Maekawa, Keisuke; Saegusa, Hiromitsu; Hiraga, Naoto; Tokiwa, Tetsuya; Kosaka, Hiroshi
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Yabuuchi, Satoshi; Kunimaru, Takanori; Yokota, Hideharu; Yamamoto, Yoichi; Maekawa, Keisuke; Ishii, Eiichi; Hiraga, Naoto
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no abstracts in English
