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Correlations of stress distributions along the fault: from laboratory fracture roughness to fault asperity squeeze

Abstract : We analyze the spatial correlations of the absolute stress field along the Nojima fault, Japan in terms of scaling invariance (self affine scaling). Despite the small range of resolution, we obtain a signature of correlations consistent with an elastic compression of the fault roughness. Indeed, we compare the wavelet spectrum of the measured stress field to that obtained from a numerical model that fully squeezes two thick elastic media bounded by interfaces which include spatially correlated asperities (i.e. non diluted asperities). Friction is assumed to follow a Coulomb law locally and interface roughness is described using the self affine topography that is observed over a very wide range of scales from fractures to faults, with a Hurst exponent H. We find that the stress field is also self affine, but with a Hurst exponent H-1. Fluctuations of the normal stress are shown to be important, especially at local scales with anti-persistent correlations.
Mots-clés : FAILLE DE NOJIMA
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Conference papers
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https://hal.inrae.fr/hal-02587438
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Submitted on : Friday, May 15, 2020 - 12:01:32 PM
Last modification on : Monday, August 2, 2021 - 10:33:24 AM

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  • HAL Id : hal-02587438, version 1
  • IRSTEA : PUB00018973

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Jean Schmittbuhl, Guillaume Chambon, A. Hansen, Matthieu Bouchon. Correlations of stress distributions along the fault: from laboratory fracture roughness to fault asperity squeeze. 11th International conference on fracture, Torino,ITA, 20-25 march 2005, 2005, torino, France. pp.6. ⟨hal-02587438⟩

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