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<identifier>oai:HAL:hal-00407986v1</identifier>
<datestamp>2018-01-11</datestamp>
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<title lang=en>Seismic anisotropy in the asthenosphere beneath the Eifel region</title>
<creator>Walker, K.</creator>
<creator>Bokelmann, Goetz</creator>
<creator>Klemperer, S.</creator>
<creator>Bock, G.</creator>
<contributor>Institute of Geophysics and Planetary Physics [San Diego] (IGPP) ; University of California [San Diego] (UC San Diego)</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>
<contributor>Department of Geophysics, Stanford University ; Université du Québec</contributor>
<contributor>GeoForschungsZentrum - Helmholtz-Zentrum Potsdam (GFZ)</contributor>
<source>Mantle plumes - a multidisciplinary approach</source>
<contributor>Joachim R. R. Ritter; Ulrich R. Christensen</contributor>
<publisher>Springer-Verlag</publisher>
<identifier>hal-00407986</identifier>
<identifier>https://hal.archives-ouvertes.fr/hal-00407986</identifier>
<source>https://hal.archives-ouvertes.fr/hal-00407986</source>
<source>Joachim R. R. Ritter; Ulrich R. Christensen. Mantle plumes - a multidisciplinary approach, Springer-Verlag, pp.439-461, 2007, 〈10.1007/978-3-540-68046-8〉</source>
<identifier>DOI : 10.1007/978-3-540-68046-8</identifier>
<relation>info:eu-repo/semantics/altIdentifier/doi/10.1007/978-3-540-68046-8</relation>
<language>en</language>
<subject>[SDU.STU.TE] Sciences of the Universe [physics]/Earth Sciences/Tectonics</subject>
<subject>[SDE.MCG] Environmental Sciences/Global Changes</subject>
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<description lang=en>We provide evidence for a plume-like upwelling beneath the Eifel hotspot, Western Germany, by using teleseismic shear-wave splitting to resolve the anisotropy associated with upwelling flow that is spreading laterally into the asthenosphere. The variation in fast-polarization azimuth we find across the Eifel hotspot is explained by a model of slowly upwelling material that is horizontally being deflected or sheared in a parabolic asthenospheric flow (PAF) pattern toward west-southwest, a direction that correlates with Eurasian absolute plate motion. We suggest that the lack of an age progression for Eifel volcanism, which is expected for a fixed-upwelling model, is a result of (1) sporadic volcanism due to a low excess plume temperature and/or varying crustal stresses that periodically relax and facilitate eruption, and (2) complex upwelling flow pathways and/or Late Tertiary changes in the slow Eurasian plate motion. The success of the PAF model in fitting the data is remarkable given the small number of parameters (four) and the consistency with the plate motion direction determined from geology and/or geodesy. This suggests that a predictable mantle-anisotropy pattern may exist also for other hotspots driven by plume-like upwellings, and that splitting can be a useful diagnostic to differentiate between plume-like and alternative sources for mantle hotspots.</description>
<date>2007</date>
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