Seismic anisotropy of the mantle lithosphere beneath the Swedish National Seismological Network (SNSN)

Body-wave analysis – shear-wave splitting and P-travel time residuals - detect anisotropic structure of the upper mantle beneath the Swedish part of Fennoscandia. Geographic variations of both the splitting measurements and the P-residual spheres map regions of different fabrics of the mantle lithos...

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Bibliographic Details
Published in:Tectonophysics
Main Authors: Eken, T., Plomerová, J. (Jaroslava), Roberts, R., Vecsey, L. (Luděk), Babuška, V. (Vladislav), Shomali, H., Bodvarsson, R.
Format: Article in Journal/Newspaper
Language:English
Published: 2010
Subjects:
Baltic Shield
mantle lithosphere
seismic anisotropy
domains and their boundaries in the mantle
Fennoscandia
Online Access:https://doi.org/10.1016/j.tecto.2009.10.012
http://hdl.handle.net/11104/0177214
Description
Summary:Body-wave analysis – shear-wave splitting and P-travel time residuals - detect anisotropic structure of the upper mantle beneath the Swedish part of Fennoscandia. Geographic variations of both the splitting measurements and the P-residual spheres map regions of different fabrics of the mantle lithosphere. The fabric of individual mantle domains is internally consistent, usually with sudden changes at their boundaries. Distinct back-azimuth dependence of SKS splitting excludes single-layer anisotropy models with horizontal symmetry axes for the whole region. Based upon joint inversion of body-wave anisotropic parameters, we instead propose 3D selfconsistent anisotropic models of well-defined mantle lithosphere domains with differently oriented fabrics approximated by hexagonal aggregates with plunging symmetry axes.

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