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Sasao, Eiji; Suzuki, Keiichi*; Yamada, Nobuto*; Kuboshima, Koji*
Proceedings of 12th SEGJ International Symposium (USB Flash Drive), 4 Pages, 2015/11
We performed investigation of a fault with thick and clay-altered damaged zone in granitic rock using cosmic ray muons at the Mizunami Underground Research Laboratory. Geology of the Laboratory consists of sedimentary rock and underlying granite with unconformable contact at the 170 meters below ground level (G.L.). A vertical fault with a thick, clay-altered damaged zone is present in the granite. The muon telescopes were settled at the G.L.-200 and -300 meters to estimate densities of granite and fault. Densities of granite, fault and sedimentary rock are calculated as 3.38, 2.88 and 1.99 g/cm, respectively. The obtained density is obviously higher than absolute value, though the reason of such difference is not clear at the moment. If the density of granite is assumed to be 2.6 g/cm, then the densities of fault and sedimentary rock are re-calculated as 2.2 and 1.5 g/cm. This result indicates that cosmic ray muons have good potential to detect geological structure.
Suzuki, Keiichi*; Nishiyama, Eiichiro*
JNC TJ7410 2005-002, 79 Pages, 2003/03
no abstracts in English
Noguchi, Shizuo*; Mo, Bai Wen*
PNC TJ7374 96-001, 27 Pages, 1996/02
no abstracts in English
Kawamura*; Nakada, Fumio*; Morishima*; Yuki*; Amemiya, Matsuo*; Miyagawa*
JNC TJ7400 2005-069, 15 Pages, 1992/03
no abstracts in English
Yamada, Nobuto; Sasao, Eiji; Kuboshima, Koji*; Suzuki, Keiichi*
no journal, ,
JAEA and KGE perform the joint research on cosmic ray muons applying detection of sub-surface geological structure such as fault, using the research gallery of the Mizunami Underground Research Laboratry. We set the detectors of cosmic ray muons in the underground gallery to assess its applicability for estimating geological structure in deep underground. We estimate the geological structure by the number of cosmic ray muons observed from November 2013 to August 2014 and confirm that we can observe the substantial number of cosmic ray muons to estimate the geological structure in the research gallery of granite at G.L.-300m.
Yamada, Nobuto; Sasao, Eiji; Suzuki, Keiichi*; Kuboshima, Koji*; Kanazawa, Sunao*
no journal, ,
JAEA and KGE perform the joint research on cosmic ray muons applying detection of sub-surface geological structure such as fault, using the research gallery of the Mizunami Underground Research Laboratory. We set the detectors of cosmic ray muons in the underground gallery to evaluate its applicability for estimating geological structure in deep underground. We estimate the geological structure by the number of cosmic ray muons observed from November 2013 to August 2014 and confirm that we can observe the substantial number of cosmic ray muons to estimate the geological structure in the research gallery of granite at -300m underground.
Sasao, Eiji; Yamada, Nobuto*; Suzuki, Keiichi*; Kuboshima, Koji*
no journal, ,
We performed investigation of fault with thick and clay-altered damaged zone in granitic rock used by cosmic ray muons at the Mizunami Underground Research Laboratory. Geology of investigated site consists of sedimentary sequence and underlying granite with unconformable contact at the 170 meters below ground level (G.L.). A fault with thick and clay-altered damaged zone is vertically distributed in granite. The muon telescopes were settled at the G.L.-200 and -300 meters to estimate densities of granite and fault. Densities of granite, fault and sedimentary rock are calculated as 3.38, 2.88 and 1.99 g/cm, respectively. The obtained density is obviously higher than absolute value, though the reason of such difference is not clear at the moment. If the density of granite is assumed to be 2.6 g/cm, then the densities of fault and sedimentary rock are re-calculated as 2.2 and 1.5 g/cm. This result indicates that cosmic ray muons have good potential to detect geological structure.
Oizumi, Ryo*; Kato, Takeshi*; Kiho, Kenzo*; Kuboshima, Koji*; Miyara, Nobukatsu
no journal, ,
no abstracts in English