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<identifier>oai:HAL:hal-00853734v1</identifier>
<datestamp>2018-01-11</datestamp>
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<title lang=en>Mapping crustal stress and strain in southwest British Columbia</title>
<creator>Balfour, N.J.</creator>
<creator>Cassidy, J.F.</creator>
<creator>Dosso, S.E.</creator>
<creator>MAZZOTTI, Stephane</creator>
<contributor>University of Victoria [Canada] (UVIC)</contributor>
<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>
<description>International audience</description>
<source>ISSN: 0148-0227</source>
<source>EISSN: 2156-2202</source>
<source>Journal of Geophysical Research</source>
<publisher>American Geophysical Union</publisher>
<identifier>hal-00853734</identifier>
<identifier>https://hal.archives-ouvertes.fr/hal-00853734</identifier>
<source>https://hal.archives-ouvertes.fr/hal-00853734</source>
<source>Journal of Geophysical Research, American Geophysical Union, 2011, 116, pp.B03314. 〈10.1029/2010JB008003〉</source>
<identifier>DOI : 10.1029/2010JB008003</identifier>
<relation>info:eu-repo/semantics/altIdentifier/doi/10.1029/2010JB008003</relation>
<language>en</language>
<subject lang=en>stress</subject>
<subject lang=en>earthquakes</subject>
<subject lang=en>strain</subject>
<subject lang=en>British Columbia</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>This paper investigates the orientation and sources of stress in the forearc of the Cascadia subduction zone in southwest British Columbia, using Bayesian inversion results from focal mechanism data and comparing results with GPS derived short-term strain rates. The subduction margin in this region includes a change in orientation from N-S in Washington State to NW-SE in British Columbia. Over 1000 focal mechanisms from North American crustal earthquakes have been calculated to identify the dominant style of faulting, and ∼600 were inverted to estimate the principal stress orientations and the stress ratio. Our results indicate the maximum horizontal compressive stress orientation changes with distance to the trench, from approximately margin-normal along the coast to approximately margin-parallel 100-150 km inland from the coast. Comparing stress orientations with GPS data, we relate the margin-normal stress direction to subduction-related strain rates due to the locked interface between the North American and Juan de Fuca plates just west of Vancouver Island. Further from the margin the plates are coupled less strongly, and the margin-parallel maximum horizontal compressive stress in the North American Plate relates to the northward push of the Oregon Block, which is also observed in the horizontal shortening direction of the residual strain rates, after the subduction component is removed.</description>
<date>2011-03-31</date>
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