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

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概要

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• 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.

• 公益社団法人 日本地震学会、地球電磁気・地球惑星圏学会 、特定非営利活動法人 日本火山学会、日本測地学会、日本惑星科学会の論文

著者

• Fabbri Olivier

  Franche Comte University

• Dubois Michel

  Departamento De Psicologia Experimental Universidade Federal Do Para

• OHTANI Tomoyuki

  Gifu University

• AMITRANO David

  ENS Mines Nancy

• Keulen Nynke

  Department Of Earth Sciences Basel University

• Pezard Philippe

  Isteem Montpellier University

• Boullier Anne-marie

  L.g.i.t.-cnrs Joseph Fourier University

• Fujimoto Koichiro

  Tokyo Gakugei Univ. Koganei Jpn

• Ito Hisao

  Geological Survey Of Japan

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

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