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<identifier>oai:HAL:hal-01380389v1</identifier>
<datestamp>2018-01-11</datestamp>
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<setSpec>subject:sdu</setSpec>
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<publisher>HAL CCSD</publisher>
<title lang=en>Upper mantle anisotropy beneath the African IRIS and Geoscope stations</title>
<creator>Barruol, Guilhem</creator>
<creator>Ben Ismail, Walid</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>
<description>International audience</description>
<source>ISSN: 0956-540X</source>
<source>EISSN: 1365-246X</source>
<source>Geophysical Journal International</source>
<publisher>Oxford University Press (OUP)</publisher>
<identifier>hal-01380389</identifier>
<identifier>https://hal.archives-ouvertes.fr/hal-01380389</identifier>
<identifier>https://hal.archives-ouvertes.fr/hal-01380389/document</identifier>
<identifier>https://hal.archives-ouvertes.fr/hal-01380389/file/Barruol_SKS_afric_GJI2001.pdf</identifier>
<source>https://hal.archives-ouvertes.fr/hal-01380389</source>
<source>Geophysical Journal International, Oxford University Press (OUP), 2001, 146 (2), pp.549-561. 〈10.1046/j.0956-540x.2001.01481.x〉</source>
<identifier>DOI : 10.1046/j.0956-540x.2001.01481.x</identifier>
<relation>info:eu-repo/semantics/altIdentifier/doi/10.1046/j.0956-540x.2001.01481.x</relation>
<language>en</language>
<subject lang=en>asthenosphere</subject>
<subject lang=en>lithosphere deformation</subject>
<subject lang=en>anisotropy</subject>
<subject lang=en>mantle</subject>
<subject lang=en>shear wave splitting</subject>
<subject lang=en>upper mantle</subject>
<subject>[SDU.STU.GP] Sciences of the Universe [physics]/Earth Sciences/Geophysics [physics.geo-ph]</subject>
<type>info:eu-repo/semantics/article</type>
<type>Journal articles</type>
<description lang=en>Upper mantle anisotropy beneath the African IRIS and Geoscope stations is investigated through the measurements of splitting of teleseismic shear waves such as SKS, SKKS and PKS phases. Seismic anisotropy data are interesting on their own as a measure of upper mantle active or frozen deformation beneath a given station, but each station is of potential interest since it can be used to retrieve source-side seismic anisotropy at remote sites if one is able to perform station-side anisotropy correction. We performed systematic investigations of teleseismic shear wave splitting at 15 stations from the IRIS and Geoscope global seismic networks, which are located on both the oceanic and the continental parts of the African plate. Anisotropy is generally well observed at continental stations. The patterns we present generally show much more complexity than the results previously published from smaller data sets. Despite this complexity, the splitting parameters generally appear in several places to contain a signature of the regional geodynamic setting (rift structures, Archaean craton, Pan-African belt), although a deeper source of anisotropy (asthenospheric) may be present. At the oceanic stations, anisotropy measurements are much more difficult to perform because the signal is generally of poor quality. MSEY, in the Seychelles (Indian ocean), is the exception and displays a clear correlation of the azimuth of the fast split shear wave with the trend of the absolute plate motion, as defined by hotspot tracks.</description>
<date>2001</date>
</dc>
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