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1999 Fiscal Year Final Research Report Summary

Integrated Studies of Internal and Permeability Structures, and Rheological Properties of Fault Zones

Research Project

Project/Area Number 10440150
Research Category

Grant-in-Aid for Scientific Research (B)

Allocation TypeSingle-year Grants
Section一般
Research Field Petrology/Mineralogy/Science of ore deposit
Research InstitutionKyoto University

Principal Investigator

SHIMAMOTO Toshihiko  Graduate School of Science, Kyoto University, Professor, 大学院・理学研究科, 教授 (20112170)

Co-Investigator(Kenkyū-buntansha) SHIMOBAAYASHI Norimasa  京都大学, 大学院・理学研究科, 助手 (70235688)
OBATA Masaaki  Graduate School of Science, Kyoto University, Professor, 大学院・理学系研究科, 教授 (20126486)
KITAMURA Masao  Graduate School of Science, Kyoto University, Professor, 大学院・理学研究科, 教授 (70004489)
SHIMIZU Ichiko  Graduate School of Science, University of Tokyo, 大学院・理学系研究科, 助手 (40211966)
LIN Aiming  Faculty of Science, Shizuoka University, Associate Professor, 理学部, 助教授 (90283861)
Project Period (FY) 1998 – 1999
Keywordsfault / fault rock / fluid circulation / fault constitutive law / grain-boundary diffusion / pore pressure / mechanism of earthquake generation / internal structures of fault zone
Research Abstract

Despite enormous amount of descriptions on faults in geological literature, the nature of faults and fault zones are not yet fully elucidate-d owing to the lack of unified viewpoint for comprehensive and interdisciplinary studies of faults. The purpose of this study is to pose a prototype of integrated fault study based on the analyses of natural fault zones and on laboratory deformation and fluid-flow experiments trying to reproduce intrafault processes in nature and determine physical properties of faults. The present research fund was to used to purchase a precise surface grinder and a lathe, and this nearly completed the specimen preparation laboratory after the principal investigator (T. Shimamoto) moved to Kyoto University two years ago. A new method of drilling through a fault zone was attempted for Nojima fault using pressurized air and bubble as coolant and lubricator, without using mud water as in ordinary drilling which is likely to damage fragile fault rocks and change thei … More r permeability. The drilling was proven to be effective in collecting nearly intact fault gouge and breccia. The major outcomes of the present research are as follows :
Internal and permeability structures of fault-zones
Fault-zone permeability structure is not known well irrespective of its crucial significance in fluid circulation in fault zones and in thermal pressurization of pore fluid at and prior to seismic fault motion. Thus a new servo-controlled gas apparatus was used to study permeability structures of Nojima fault, Neodani fault, Median Tectonic line and Yanagase fault. The results have revealed that the fault zones consist of very impermeable fault gouge and fault breccia zones with quite variable permeability. Internal and permeability structures of fault zones are very variable, and thermal pressurization may or may not occur depending on fault zones. The present work will be extended to the examination of other faults and to permeability measurements at high temperatures.
High-velocity friction of faults and earthquake-generating processes
Experiments on the slip-weakening processes during frictional melting using a high-velocity rotary shear apparatus have revealed that the weakening is caused by the growth of molten layer, not by the reduction of melt viscosity. This suggests that the rate of melting, rather than the surface topography of faults, is the most critical factor in determining the slip weakening distance (a critical parameter for fault instability). This work will be extended to high-velocity friction experiments under pore-water pressure. Less

  • Research Products

    (15 results)

All Other

All Publications (15 results)

  • [Publications] Tsutsumi A..Shimamoto,T.,Kawamoto.E. and Logan.J.M.: "Near-shore flow velocity of Southwest Hokkaido earthquake tsunami"Jour. of Waterway, Port, Coastal and Ocean Eng., ACME. 126. 136-143 (2000)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] Lin A. and Shimamoto T.: "Selective melting processes as inferred from experimentally generated pseudotachylytes"Jour. Asian Earth Sci.. 16. 533-544 (1998)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] Kawamoto E. & Shimamoto T.: "The strength profile for bimineralic shear zones : an insight from high-temperature shearing experiments on calcite-halite mixtures"Tectonophysics. 295. 1-14 (1998)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] Lin A., et al.: "Cataclastic rocks found along the Nojima fault in Awaji Island, Japan and their implications for the tectonic history"Island Arc. 9(印刷中). (2000)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] Shimizu I.: "Astochastic model of grain size distribution during dynamic recrystallization"Philosophical Magazine. 79. 1217-1231 (1999)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] Shimamoto T.: "Down to the seismogenic depth : how much do we know?"Proc. of Hokudan International Symposium and School on Active Faulting. 449-450 (2000)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] Shimizu I.: "Nonequilibriun thermodynamics of nonhydrostatically stressed solids"Earthquake Thermodynamics and Phase Transformation in the Earth's Interior, edited by R.Teissevre and E.Maiewski Academic Press. (印刷中). (2000)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] Shimamoto, T: "The role of structural geology in the earthquake prediction studies (in Japanese)"Geological Sciety of Japan Memoir. 50. 57-60 (1998)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] Friendman, M., Logan, J. M. and Shimamoto, T.: "Cataclastic fabrics in experimental shear zones, in Snoke, A. W., Tullis, J. and Todd, V. R., eds."Fault-Related Rocks - A Photographic Atlas, Prinston Univ.Press. 70-71 (1998)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] Lin A. and Shimamoto T.: "Selective melting processes as inferred from experimentally generated pseudotachylytes"Jour.Asian Earth Sci.. vol.16. 533-545 (1998)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] Shimamoto, T.: "A new high-velocity hydrothermal frictional testing machine and its significance in the studies of earthquake initiation processes, in Koh, H. J. and Lee, B. J., eds., "Tectonic Evolution of East Asia""Proceedings for the First Joint Meeting of Japanese and Korean Structure and Tectonic Research Group, Korea Institute of Geology, Mining and Materials, Seoul, Korea. 79-84 (1998)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] Shimizu, I.: "Dynamic recrystallization in rocks (in Japanese)"Geological Society of Japan Memoir. 50. 1-12 (1998)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] Tsutsumi, A., Shimamoto, T., Kawamoto, E. and Logan, J. M.: "Near-shore flow velosity of Southwest-Hokkaido-Earthquake tsunami"Jour.Waterway, Port and Coastal and Ocean Eng., ASCE. 126. 136-143 (2000)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] Lin, A., Shimamoto, T., Maruyama, T., Shigetomi, M., Miyata, T., Uda, S., Takemura, K.. Tanaka, H., and Murata, A.: "Comparative study of cataclastic rocks from a drill core and outcrops of the Nojima fault zone in Awaji island, Japan, Special Issue, "Nojima Faut-Zone Probe""Island Arc. (in press).

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] Mizoguchi, K., Hirose, T. and Shimamoto, T.: "Permeability structure of Nojima fault : analyses of Funaki outcrop, Hokudan-cho, Tsuna-gun, Hyogo Prefecture (in Japanese)"Earth Monthly. (in press).

    • Description
      「研究成果報告書概要(欧文)」より

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Published: 2001-10-23   Modified: 2023-06-09  

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