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Tsukui, Rota*; Nishiki, Tsukasa*; Higashinaka, Motonori*; Tsu, Nobuhiro*
JAEA-Data/Code 2006-026, 103 Pages, 2007/02
JAEA-Data-Code-2006-026.pdf:16.81MB
For the 1st phase of Horonobe Underground Research Laboratory Project, Japan Atomic Energy Agency, Geological Isolation Research and Development Directorate, Horonobe Underground Research Unit (before October 1, 2005: Japan Nuclear Cycle Development Institute Horonobe Underground Research Center) was carried out following three geophysical surveys in FY2004. *Seismic Reflection Survey *Multi-Offset VSP Survey *Gravity Survey / This document presents the outline and results of these geophysical surveys.
Higashinaka, Motonori*; Sano, Yukiko*; Kozawa, Takeshi*
JNC TJ5410 2005-009, 96 Pages, 2005/08
JNC-TJ5410-2005-009.pdf:36.66MB
This document is to report the result of existing seismic data reprocessing around Horonobe town, Hokkaido, Japan, which is a part of the Horonbe Undergounrd Research Project. The main purpose of the re-processing is to recognize the subsurface structure of Omagari Fault and fold sysytem around Omagari Fault. The seismic lines fore re-processing are TYHR-A3 and SHRB-2line, which is surceyed in 1975. Applying weathering static correction using refraction analysis and noise suprression procedure, we have much enhanced sesmic prifile.
Higashinaka, Motonori*
JNC TJ5410 2004-003, 15 Pages, 2004/03
JNC-TJ5410-2004-003.pdf:19.7MB
This document is to report the results of Gravity data reprocessing around Horonobe town, Hokkaido, Japan, which is a part of the Horonobe underground research program. The main purpose of this reprocessing is to recognize the effect of Omagari Fault in gravity anomaly. Following information was obtained from Gravity anomaly maps and gravity forward modeling results. (1) There is NWN-SWS Low gravity anomaly belt in west side of predicted Omagari Fault position. (2) Gravity forward modeling shows that low gravity anomaly was explained by assuming low density to Koetoi Formation, especially lower density near anticline axis. (3) Using simple fault model, gravity forward modeling shows that the high-resolution gravity survey will provide more detailed information about the position of fault. The desirable gravity data sampling interval are denser than 100m. This gravity re-processing provides some useful information to know the geological structure and its characters around Omagari Fault.
Higashinaka, Motonori*; Tsukui, Rota*; Ota, Yoichi*
JNC TJ1410 2002-002, 307 Pages, 2002/12