Attenuation tomography of the upper mantle
Autor: | Adenis, Alice, Debayle, E., Ricard, Y. |
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Přispěvatelé: | Laboratoire de Géologie de Lyon - Terre, Planètes, Environnement (LGL-TPE), École normale supérieure de Lyon (ENS de Lyon)-Université Claude Bernard Lyon 1 (UCBL), Université de Lyon-Université de Lyon-Institut national des sciences de l'Univers (INSU - CNRS)-Université Jean Monnet - Saint-Étienne (UJM)-Centre National de la Recherche Scientifique (CNRS), Laboratoire de Sciences de la Terre (LST), École normale supérieure - Lyon (ENS Lyon)-Université Claude Bernard Lyon 1 (UCBL), Université de Lyon-Université de Lyon-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National de la Recherche Scientifique (CNRS), ricard, yanick |
Jazyk: | angličtina |
Rok vydání: | 2017 |
Předmět: |
Pacific Ocean
[SDU.STU.GP]Sciences of the Universe [physics]/Earth Sciences/Geophysics [physics.geo-ph] [SDU]Sciences of the Universe [physics] surface wave [SDU.STU]Sciences of the Universe [physics]/Earth Sciences [SDU.STU.GP] Sciences of the Universe [physics]/Earth Sciences/Geophysics [physics.geo-ph] tomography shear wave attenuation mantle |
Zdroj: | Geophysical Research Letters Geophysical Research Letters, 2017, 44, pp.7715-7724. ⟨10.1002/2017GL073751⟩ Geophysical Research Letters, American Geophysical Union, 2017, 44 (15), pp.7715-7724 Geophysical Research Letters, 2017, 44 (15), pp.7715-7724 |
ISSN: | 0094-8276 1944-8007 |
Popis: | cited By 3; International audience; We present QsADR17, a global shear wave attenuation model of the upper mantle. Synthetic tests confirm that large-scale shear attenuation anomalies are resolved in the whole upper mantle with limited vertical smearing (≤50 km). QsADR17 shows strong correlation with surface tectonics down to 200 km depth, with low attenuation beneath continents and high attenuation beneath oceans. The attenuation signal near 250 km depth is dominated by a high-quality factor along subduction zones. Attenuating anomalies are found beneath mid-ocean ridges down to 150 km and under most Pacific hot spots from the lithosphere down to the transition zone. The presence of broad attenuating anomalies at 150 km depth in the Pacific Ocean suggests that several thermal plumes pond in the asthenosphere. Evidence for compositional heterogeneities is found in the lithosphere at the base of cratons and in a number of active regions. ©2017. American Geophysical Union. All Rights Reserved. |
Databáze: | OpenAIRE |
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