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Fault zone geology: lessons from drilling through the Nojima and Chelungpu faults

Anne-Marie Boullier 1, *
* Corresponding author
1 Mécanique des failles [?-2015]
ISTerre [2011-2015] - Institut des Sciences de la Terre [2011-2015]
Abstract : Several drilling projects have been conducted through active faults with the aim of learning about the geology of the fault zones and tentatively correlating the structure and mineralogy of the fault zones with their seismological behaviour during recent earthquakes. Here we present the major results obtained from structural and mineralogical studies of core samples retrieved from the dextral reverse strike-slip Nojima Fault (Japan) within granitic rocks following the Kobe earthquake (1995), and from the Chelungpu thrust Fault (Taiwan) within alternating silts and shales following the Chi-Chi earthquake (1999). We show how these projects, despite not fullfilling all their objectives, have still contributed to a better geological knowledge of the fault zones, to a better characterization of the slip zones related to the recent earthquakes particularly of their thickness, microstructures and deformation mechanisms, and to a better understanding of the nature and role of fluids within the fault zone. They also have led to new questions, and to new approaches for studying fault rock samples. For all these reasons, they have stimulated international scientific research about fault zone geology.
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Submitted on : Wednesday, May 4, 2011 - 5:42:38 PM
Last modification on : Monday, July 20, 2020 - 10:58:02 AM
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Anne-Marie Boullier. Fault zone geology: lessons from drilling through the Nojima and Chelungpu faults. 2011. ⟨insu-00590704⟩

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