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<title lang=en>Displacement and interaction of normal fault segments branched at depth: Implications for fault growth and potential earthquake rupture size</title>
<creator>Soliva, Roger</creator>
<creator>Benedicto, A.</creator>
<creator>Schultz, R. A.</creator>
<creator>Maerten, L.</creator>
<creator>Micarelli, L.</creator>
<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>
<contributor>Laboratoire de tectonique (LT) ; Université Pierre et Marie Curie - Paris 6 (UPMC) - Institut national des sciences de l'Univers (INSU - CNRS) - Université de Cergy Pontoise - Centre National de la Recherche Scientifique (CNRS)</contributor>
<contributor>Department of Geological Sciences and Engineering, University of Nevada, Reno ; Université du Québec</contributor>
<source>ISSN: 0191-8141</source>
<source>Journal of Structural Geology</source>
<publisher>Elsevier</publisher>
<identifier>hal-00411161</identifier>
<identifier>https://hal.archives-ouvertes.fr/hal-00411161</identifier>
<source>https://hal.archives-ouvertes.fr/hal-00411161</source>
<source>Journal of Structural Geology, Elsevier, 2008, 30 (10), pp.1288-1299. 〈10.1016/j.jsg.2008.07.005〉</source>
<identifier>DOI : 10.1016/j.jsg.2008.07.005</identifier>
<relation>info:eu-repo/semantics/altIdentifier/doi/10.1016/j.jsg.2008.07.005</relation>
<language>en</language>
<subject lang=en>Fault segmentation</subject>
<subject lang=en>Displacement</subject>
<subject lang=en>Fault interaction</subject>
<subject lang=en>Branching</subject>
<subject lang=en>Earthquake rupture length</subject>
<subject lang=en>Active normal faults</subject>
<subject lang=en>northern north-sea</subject>
<subject lang=en>san-andreas fault</subject>
<subject lang=en>slip</subject>
<subject lang=en>distributions</subject>
<subject lang=en>seismic data</subject>
<subject lang=en>structural evolution</subject>
<subject lang=en>southern apennines</subject>
<subject lang=en>lucanian apennines</subject>
<subject lang=en>mechanical models</subject>
<subject lang=en>zone geometry</subject>
<subject>[SDU.STU.TE] Sciences of the Universe [physics]/Earth Sciences/Tectonics</subject>
<subject>[SDE.MCG] Environmental Sciences/Global Changes</subject>
<type>info:eu-repo/semantics/article</type>
<type>Journal articles</type>
<description lang=en>We present field data from segmented normal faults having particular displacement and overlapping geometries that may be related to down-dip branching of the fault segments. Based on a 3-D numerical modeling study of computed displacement and stress fields around different geometries of down-dip branched normal fault segments, we show that the bends of fault surfaces that coalesce at depth exert a significant influence on (I) the displacement distribution on the fault segment branches and (2) the quasi-static stress fields around the relay zones. The asymmetry in the displacement profiles and low fault interaction at relay zones modeled are consistent with the fault segment geometries observed in field data. As an application, we model the geometry and interaction of the Vallo di Diano normal fault which is segmented at the Earth's surface and which produced an earthquake of magnitude 6.4 along a single fault surface at depth. Numerical modeling of the segmented fault produces an asymmetric displacement profile and low shear stress at the relay zone consistent with the profile and fault interaction inferred from the held. We conclude that asymmetry of the displacement profile and large overlap/separation ratio of the unlinked relay zone can be indicators of the presence of a continuous fault surface underneath. These geometrical attributes are therefore important to consider in the probabilistic analysis of seismic hazard along segmented normal faults.</description>
<date>2008</date>
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