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Volume 56 Supplement 12

Special Issue: Slip and Flow Processes in and below the Seismogenic Region (2)

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Structural evolution of the Nojima fault (Awaji Island, Japan) revisited from the GSJ drill hole at Hirabayashi

Earth, Planets and Space volume 56, pages 1233–1240 (2004)Cite this article

Abstract

Following the Hyogoken Nanbu earthquake (January 17, 1995, Mw=7.2), three drillholes were sunk through the Nojima Fault (Awaji Island, Japan). Textural and petrographic studies of the Geological Survey of Japan (GSJ) drill cores allow recognition of two deformation episodes. The first one is older than the deposition of the Middle to Late Eocene Kobe Group, corresponds to a left-lateral movement on the Nojima fault and is expressed by pseudotachylytes, kinking of biotite crystals in the low-strain rocks and an intense laumontite hydrothermal alteration. The second one displaces the basal unconformity of the Kobe group, corresponds to a right-lateral reverse displacement and is expressed at least by carbonate-filled hydraulic fractures and thin gouge zones. Different important deformation mechanisms are recorded by the fault rocks, but questions relating to the attribution of deformation and alteration features to one or other deformation episodes remain unresolved.

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Author information

Authors and Affiliations

  1. L.G.I.T.-CNRS, Joseph Fourier University, Grenoble, France

    Anne-Marie Boullier

  2. Tokyo Gakugei University, Japan

    Koichiro Fujimoto

  3. Geological Survey of Japan, AIST-Earthquake Research Group, Tsukuba, Japan

    Hisao Ito

  4. Gifu University, Japan

    Tomoyuki Ohtani

  5. Department of Earth Sciences, Basel University, Switzerland

    Nynke Keulen

  6. Franche Comté University, Besançon, France

    Olivier Fabbri

  7. ENS Mines Nancy, France

    David Amitrano

  8. Department of Earth Sciences, Lille University, France

    Michel Dubois

  9. ISTEEM, Montpellier University, France

    Philippe Pezard

Authors
  1. Anne-Marie Boullier
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  2. Koichiro Fujimoto
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  3. Hisao Ito
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  4. Tomoyuki Ohtani
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  5. Nynke Keulen
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  6. Olivier Fabbri
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  7. David Amitrano
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  8. Michel Dubois
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  9. Philippe Pezard
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Correspondence to Anne-Marie Boullier.

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Boullier, AM., Fujimoto, K., Ito, H. et al. Structural evolution of the Nojima fault (Awaji Island, Japan) revisited from the GSJ drill hole at Hirabayashi. Earth Planet Sp 56, 1233–1240 (2004). https://doi.org/10.1186/BF03353345

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  • DOI: https://doi.org/10.1186/BF03353345

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