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<title lang=en>Discontinuous low-velocity zones in southern Tibet question the viability of the channel flow model</title>
<creator>Hetenyi, Gyoergy</creator>
<creator>Vergne, J.</creator>
<creator>Bollinger, Laurent</creator>
<creator>Cattin, Rodolphe</creator>
<contributor>Eidgenössische Technische Hochschule [Zürich] (ETH Zürich)</contributor>
<contributor>Laboratoire de géologie de l'ENS (LGE) ; École normale supérieure - Paris (ENS Paris) - Institut national des sciences de l'Univers (INSU - CNRS) - Centre National de la Recherche Scientifique (CNRS)</contributor>
<contributor>DAM Île-de-France (DAM/DIF) ; Commissariat à l'énergie atomique et aux énergies alternatives (CEA)</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>Growth and Collapse of the Tibetan Plateau</source>
<contributor>Gloaguen, R. & Ratschbacher, L.</contributor>
<publisher>Geological Society of London</publisher>
<identifier>hal-00853971</identifier>
<identifier>https://hal.archives-ouvertes.fr/hal-00853971</identifier>
<source>https://hal.archives-ouvertes.fr/hal-00853971</source>
<source>Gloaguen, R. & Ratschbacher, L. Growth and Collapse of the Tibetan Plateau, Geological Society of London, pp.99-108, 2011, Geological Society Special Publication, 353, 〈10.1144/SP353.6〉</source>
<identifier>DOI : 10.1144/SP353.6</identifier>
<relation>info:eu-repo/semantics/altIdentifier/doi/10.1144/SP353.6</relation>
<language>en</language>
<subject lang=da>Tibet</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/bookPart</type>
<type>Book sections</type>
<description lang=en>Low-velocity zones ('bright spots') imaged by the INDEPTH seismic experiment in southern Tibet are extensively interpreted as widespread partial melt within the crust, which has given a strong support for the channel flow model. These suggest that a continuous seismic low-velocity zone underlies Tibet on the large scale. Here we take advantage of the Hi-CLIMB seismic experiment which includes a dense south-north profile and a lateral 2D seismic network to assess the vertical and the horizontal extension of low-velocity zones in southern Tibet. Several approaches including migration, amplitude analysis and waveform inversion of receiver functions are performed to detect crustal low-velocity zones using this new seismological dataset. Our results reveal localized and discontinuous low-velocity zones in Tibet. They indicate that the vertical extension of the low-velocity zones is about 10 km, and their maximum horizontal length appears to be c. 50 km. Our study suggests a partial correlation between the location of these low-velocity zones and the spatial distribution of Tibetan grabens. These results, especially the non-continuity of low-velocity zones, together with the observed regular value of mean crustal VP/VS ratio, question the existence of widespread partial melt of the southern Tibetan crust and, therefore, the viability of the channel flow model.</description>
<date>2011-04-26</date>
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