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Journal Articles

Integrated description of deformation modes in a sedimentary basin; A Case study around a shallow drilling site in the Mizunami area, eastern part of southwest Japan

Ito, Yasuto*; Amano, Kenji; Kumazaki, Naoki*

Island Arc, 15(1), p.165 - 177, 2006/03

 Times Cited Count:3 Percentile:10.95(Geosciences, Multidisciplinary)

Tectonic episodes in a sedimentary basin are described on the basis of an integrated study combining reflection seismic interpretation, drilling survey and paleomagnetism. A shallow inclined borehole penetrated a fault shown by reflection seismic and geological surveys in the Mizunami area, the eastern part of southwest Japan. Paleomagnetic measurements were executed on core samples successfully oriented using side-wall image logging of structural attitude. At six horizons, we confirmed stable characteristic remanent magnetization (ChRM) through thermal and alternating field demagnetization tests, which is carried by magnetite with minor amount of high coercivity minerals as revealed by experiment of stepwise acquisition of isothermal remanent magnetization. After correction of multi-phase deformation inferred from borehole structural analysis, ChRM directions are combined with previous data and confirm easterly deflection reflecting coherent clockwise rotation of the arc before the Middle Miocene. Compilation of reliable paleomagnetic data describes differential rotation of the eastern part of southwest Japan raised by collision of the Izu-Bonin arc since the Middle Miocene.

JAEA Reports

The Construction of geological model using an iterative approach; Step 1 and step 2

Matsuoka, Toshiyuki; Kumazaki, Naoki*; Saegusa, Hiromitsu; Sasaki, Keiichi; Endo, Yoshinobu*; Amano, Kenji

JNC TN7400 2005-007, 99 Pages, 2005/03

JNC-TN7400-2005-007.pdf:4.93MB

One of the main goals of the Mizunami Underground Research Laboratory (MIU) Project is to establish appropriate methodologies for reliably investigating and assessing the deep subsurface. This report documents the results of geological modeling of Step1 and Step2 using the iterative investigation approach at the site-scale (several 100m to several km in area). For the Step1 model, existing information (e.g. literature), and results from geological mapping and reflection seismic survey were used. For the Step2 model, additional information obtained from the geological investigation using existing borehole and the shallow borehole investigation were incorporated. As a result of this study, geological elements that should be represented in the model were defined, and several major faults with trends of NNW, EW and NE trend were identified (or inferred) in the vicinity of the MIU-site.

JAEA Reports

Synthesis of the Shallow Borehole Investigations at the MIU Construction Site

Kumazaki, Naoki; Koki, Ikeda; Goto, Junichi; Mukai, Kei; Iwatsuki, Teruki; Furue, Ryoji

JNC TN7400 2003-005, 112 Pages, 2003/08

JNC-TN7400-2003-005.pdf:9.72MB

The Shallow Borehole Investigations were one of the first programmes to be conducted at the MIU Construction Site, together with the reflection seismic survey and the re-investigation of borehole DH-2. The Shallow Borehole Investigation targeted the shallow part of the site, from the sedimentary cover rocks to the upper part of the granite. The main aims are understanding of initial groundwater flow and the groundwater chemistry, long term monitoring and to identify structural discontinuities in the sedimentary rocks and the weathered granite. From April to October 2002 four boreholes were drilled through the sedimentary sequence and the weathered granite section at the MIU Construction Site. Planned geological, hydrogeological and hydrochemical investigations were carried out. MP systems were installed in all boreholes by December 2002 and continuous monitoring of hydraulic head begun. Information on geology, hydrogeology and hydrochemistry of the sedimentary formation and the weathered granite was acquired. JNC's quality control procedures for borehole investigation programmes were employed. In addition, recommendations for future borehole investigation programmes, especially in sedimentary rocks, were given.

JAEA Reports

Mizunami Underground Research Project, Annual report in the 2002 fiscal year

Ota, Kunio; Amano, Kenji; Kumazaki, Naoki; Matsuoka, Toshiyuki; Takeuchi, Shinji; Masumoto, Kazuhiko; Yabuuchi, Satoshi

JNC TN7410 2003-006, 127 Pages, 2003/07

JNC-TN7410-2003-006.pdf:7.94MB
JNC-TN7410-2003-006(errata).pdf:0.08MB

The current geoscientific research of the Mizunami Underground Research Laboratory (MIU) Project have been carried out since the 1996 fiscal year at the Shobasama site in Akeyo-cho, Mizunami City, Gifu Prefecture. The main goals of the MIU Project are to establish appropriate methodologies for reliably investigating and assessing the deep subsurface, and to develop a range of engineering techniques for deep underground application in granite. The site for MIU construction was changed in January 2002, from the Shobasama site to city-owned land (MIU Construction Site) after lease contract with Mizunami city. The surface-based investigations at the MIU facility site have started since February 2002. In 2002 fiscal year, geophysical survey and shallow borehole investigations was conducted and deep borehole investigations have started for modeling and characterization of geological environment in the MIU Construction Site before sinking the shafts. Detail of study and survey during the construction phase of MIU project was planned based on the layout and plan of construction of the underground facilities for development of engineering technologies in a deep underground. In Shobasama site, VSP survey was carried out to improve the model of geological environment. Hydrogeological model was calibrated using the results of long-term pumping test and long-term subsurface and groundwater monitoring. Important factors for hydrogeological modeling were evaluated as the results of numerical analysis by multiple approaches of groundwater flow modeling. The preliminary analysis based on the rock mechanical model at the Shobasama site was performed to estimate the deformation caused by excavation of the underground facilities.

JAEA Reports

Working Program for MIZ-1 Borehole Investigations

Nakano, Katsushi; Amano, Kenji; Takeuchi, Shinji; Ikeda, Koki; Saegusa, Hiromitsu; Hama, Katsuhiro; Kumazaki, Naoki; Iwatsuki, Teruki; Yabuuchi, Satoshi; Sato, Toshinori

JNC TN7400 2002-008, 77 Pages, 2003/03

JNC-TN7400-2002-008.pdf:82.29MB

JAEA Reports

An Overview of the MIU-4 Borehole Investigations during Phase IV

Kumazaki, Naoki; ; Ikeda, Koki; Amano, Kenji; Takeuchi, Shinji; Hama, Katsuhiro; G.F.D.McCrank*

JNC TN7400 2002-006, 59 Pages, 2002/12

JNC-TN7400-2002-006.pdf:10.03MB

Surface-based investigations are now being carried out at the MIU site. Drilling of the MIU-4 borehole, one of the planned surface-based investigations in the MIU project, commenced in June 2000. The main aims of the MIU-4 borehole investigations are to address key issues (e.g. hydrochemistry, 3-D rock mechanics, geometry of steeply dipping water-conducting fractures, etc) remaining after the previous borehole investigations and to continue the development of appropriate, comprehensive techniques for assessing the deep subsurface. The borehole was drilled from the centre of the MIU site in a north-easterly direction; the inclination and planned drilling length is 30$$^{circ}$$ from the vertical and 790m respectively. During MIU-4 Phase IV (from October 2000 to July 2001), the borehole was drilled through the hanging wall of the Tsukiyoshi fault in the basement granite (from 134.47 to 673.26m along the borehole) at the MIU site. Planned geological, hydrogeological, hydrochemical and additional investigations were carried out. Quality-controlled information on geology, hydrogeology and hydrochemistry of the hanging wall of the Tsukiyoshi fault in the basement granite was acquired and consequently this advanced the understanding of the geological environment at the MIU site. The techniques and QA/QC procedures adopted for the MIU-4 Phase I to III investigations proved to be effective for the current borehole investigations. In addition, recommendations for the remaining MIU-4 Phases and future borehole investigation programmes are provided.

JAEA Reports

Working Program for Shallow Borehole Investigations

; Ikeda, Koki; Kumazaki, Naoki; Mukai, Kei; Iwatsuki, Teruki; Hama, Katsuhiro

JNC TN7400 2002-005, 58 Pages, 2002/07

JNC-TN7400-2002-005.pdf:2.18MB

he MIU project has been conducted at the Shobasama site since 1997. JNC decided to shift the construction site for the underground research laboratory to the Mizunami city's property at Togari/Yamanouchi in 2001. The contract to lease the land was signed in January of 2002, and the investigations from surface have now started. In the revised general plan for the geoscientific research programme of the MIU project (JNC, 2002), investigations are conducted in three phases, Phase 1 surface-based investigations, Phase 2 during excavation of shafts and experimental tunnels and Phase 3 the underground operations. Overall objectives of the project are: To develop basic techniques to investigate, analyse and evaluate the deep geological environment, and To develop basic engineering techniques for use in the deep underground. Objectives of phase 1, surface-based investigations are: To construct a geological model based on the investigation from surface and understand the deep geological environment before excavation of the shaft and experimental drifts, To develop the detailed design and construction plan of the shaft and experimental drifts, and To develop scientific plans for Phase 2, investigations during excavation of the shaft and experimental drifts. In the MIU project and the Regional Hydrogeological Study(RHS), a large surface-based study surrounding the MIU, three scales of investigation are employed They are: Regional scale(several 10km square), Local scale(several km square), and Block scale(several 100m square). Investigations in the MIU project are, for the most part, perfomed at the block scale while those in the Regional Hydrogeological Study (RHS) project are performed at the regional and local scales. The Phase 1 surface-based investigations are planned for completion by the end of 2004, while excavation of the main shaft is planned to start within the fiscal year of 2003. The Shallow Borehole Investigations are one of the first programmes, together with the

JAEA Reports

An Overview of the MIU-4 Borehole Investigations during Phase III

Kumazaki, Naoki; ; Nakano, Katsushi; Ikeda, Koki; Amano, Kenji; Takeuchi, Shinji; Hama, Katsuhiro

JNC TN7400 2002-002, 39 Pages, 2002/04

JNC-TN7400-2002-002.pdf:9.44MB

Surface-based investigations are now being carried out at the MIU site. Drilling of the MIU-4 borehole, one of the planned surface-based investigations in the MIU project, was commenced in June 2000. The main aims of the MIU-4 borehole investigations are to address the key issues (eg hydrochemistry, 3-D rock mechanics, geometry of steeply dipping water-conducting fractures, etc) remaining after the previous borehole investigations and to continue the development of appropriate, comprehensive techniques for assessing the deep subsurface. The borehole was dfilled from the centre of the MIU site in a north-easterly direction; the inclination and planned drilling length is 30$$^{circ}$$ from the vertical and 790m respectively. During MIU-4 Phase III (from july to October 2000), the borehole was drilled through the entire weathered section of the basement granite (from 88.65 to 134.47m along the borehole) at the MIU site. Planned geological, hydrogeological, hydrochemical, and additional investigations were carried out. High-quality information on geology, hydrogeology and hydrochemistry of the weathered granite was acquired and consequently this advanced the understanding of the geological environment at the MIU site. The techniques and QA/QC procedures adopted to the MIU-4 Phase I/II investigations proved to be effective for the current borehole investigations. In addition, a couple of recommendations for the remaining MIU-4 Phases and future borehole investigation programmes were given.

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