A High-Resolution Shear Velocity Model of the Crust and Uppermost Mantle beneath Westernmost Mediterranean including Radial Anisotropy

This is a Preprint and has not been peer reviewed. This is version 4 of this Preprint.

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Authors

Lili Feng 

Abstract

Using seismic data from 1186 stations deployed across the westernmost Mediterranean, I construct a high-resolution 3-D radially anisotropic model from a joint inversion of Rayleigh and Love wave dispersions, along with receiver functions. The Rayleigh and Love data are extracted from both ambient noise interferograms and earthquake waveforms, and a new three-station ambient noise interferometry method is used to further improve the data coverage. Features captured by the model include the following: (1) Crustal radial anisotropy identifies regions that have undergone extensional deformation, providing seismic constraints for a better understanding of the Africa-Iberia movement during the Cenozoic Era. (2) Crustal thickness map identifies regions with thick crust, including the Pyrenees, the Iberian Chain, the Gibraltar Arc and the Atlas Mountains. (3) The Iberian Massif is outlined as a high shear wave velocity block in the crust. (4) A sharp boundary between the Limousin and the Massif Central is imaged, low Vsv in the mantle beneath the Massif Central reflects remaining thermal signature of the magma. (5) The geometry of the Alboran slab is captured by the model, consistent with prediction from geodynamical modeling. (6) In the mantle beneath the Atlas Mountains, widespread low Vsv and positive radial anisotropy is observed, favoring the edge-driven convection (EDC) model explaining the lithospheric thinning.

DOI

https://doi.org/10.31223/X5TC8P

Subjects

Earth Sciences

Keywords

Dates

Published: 2021-05-13 14:56

Last Updated: 2021-11-18 21:39

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CC BY Attribution 4.0 International

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