Attenuation tomography of the upper mantle - Archive ouverte HAL Access content directly
Journal Articles Geophysical Research Letters Year : 2017

Attenuation tomography of the upper mantle

(1) , (1) , (1)
1

Abstract

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.
Fichier principal
Vignette du fichier
Geophysical Research Letters - 2017 - Adenis - Attenuation tomography of the upper mantle.pdf (3.69 Mo) Télécharger le fichier
Origin : Publisher files allowed on an open archive

Dates and versions

insu-03710108 , version 1 (30-06-2022)

Licence

Copyright

Identifiers

Cite

Alice Adenis, Eric Debayle, Yanick Ricard. Attenuation tomography of the upper mantle. Geophysical Research Letters, 2017, 44, pp.7715-7724. ⟨10.1002/2017GL073751⟩. ⟨insu-03710108⟩
14 View
5 Download

Altmetric

Share

Gmail Facebook Twitter LinkedIn More