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<datestamp>2018-01-11</datestamp>
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<publisher>HAL CCSD</publisher>
<title lang=en>In-situ characterization of the effective elasticity of a fault zone, and its relationship to fracture spacing</title>
<creator>Steer, Philippe</creator>
<creator>Bigot, Aurelien</creator>
<creator>Cattin, Rodolphe</creator>
<creator>Soliva, Roger</creator>
<contributor>Risques ; Géosciences Montpellier ; Université des Antilles et de la Guyane (UAG) - Institut national des sciences de l'Univers (INSU - CNRS) - Université de Montpellier (UM) - Centre National de la Recherche Scientifique (CNRS) - Université des Antilles et de la Guyane (UAG) - Institut national des sciences de l'Univers (INSU - CNRS) - Université de Montpellier (UM) - Centre National de la Recherche Scientifique (CNRS)</contributor>
<contributor>Géosciences Montpellier ; Université des Antilles et de la Guyane (UAG) - Institut national des sciences de l'Univers (INSU - CNRS) - Université de Montpellier (UM) - Centre National de la Recherche Scientifique (CNRS)</contributor>
<description>International audience</description>
<source>ISSN: 0191-8141</source>
<source>Journal of Structural Geology</source>
<publisher>Elsevier</publisher>
<identifier>hal-00669954</identifier>
<identifier>https://hal.archives-ouvertes.fr/hal-00669954</identifier>
<source>https://hal.archives-ouvertes.fr/hal-00669954</source>
<source>Journal of Structural Geology, Elsevier, 2011, 33 (11), pp.1541-1553. 〈10.1016/j.jsg.2011.09.009〉</source>
<identifier>DOI : 10.1016/j.jsg.2011.09.009</identifier>
<relation>info:eu-repo/semantics/altIdentifier/doi/10.1016/j.jsg.2011.09.009</relation>
<language>en</language>
<subject lang=en>Fault zone</subject>
<subject lang=en>Fracture spacing</subject>
<subject lang=en>Fracture stiffness</subject>
<subject lang=en>Effective elasticity</subject>
<subject lang=en>Schmidt hammer</subject>
<subject lang=en>Fracture healing</subject>
<subject>[SDU.STU.GP] Sciences of the Universe [physics]/Earth Sciences/Geophysics [physics.geo-ph]</subject>
<subject>[PHYS.PHYS.PHYS-GEO-PH] Physics [physics]/Physics [physics]/Geophysics [physics.geo-ph]</subject>
<subject>[SDE.MCG] Environmental Sciences/Global Changes</subject>
<type>info:eu-repo/semantics/article</type>
<type>Journal articles</type>
<description lang=en>In this paper, we describe an outcrop to characterize the effect of fracture spacing and type on larger scale effective elasticity, which is measured for the first time in-situ with a Schmidt hammer. The outcrop is dominated by lime mudstones and belongs to the deformation zone of the St Clement fault, in southern France. Our results suggest that small spacing of faults, open fractures and styolites leads to lesser effective Young's modulus, whereas small sealed fracture spacing leads to greater effective Young's modulus. These relationships are compatible with theoretical models of effective elasticity. Using Amadei and Savage (1993) approach, we define a non-linear model that relates Schmidt hammer rebound to spacing by fracture type. A hemisphere with a radius of 40 to similar to 200 cm is the rheological volume characterized by the Schmidt hammer. Results of model inversion demonstrate that variations of Schmidt hammer rebound over the outcrop can be used to estimate fracture type and stiffness. Stiffness of sealed fractures is 2-3 orders of magnitude greater than the stiffness of faults, stylolites and open fractures. This result is consistent with an increase of the rate of interseismic stress build-up of major faults with sealing of fractures in their damage zone.</description>
<date>2011</date>
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