Radial seismic anisotropy as a constraint for upper mantle rheology

By Thorsten W. Becker, B. Kustowski, G. Ekström. 2007

136 citations recorded by the source corpus.

View Paper: https://www.semanticscholar.org/paper/473932c4d23d1f3a3144d3348cc2a0543b400f7f

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In Geophysics

Citations in the corpus

Whole-mantle radially anisotropic shear velocity structure from spectral-element waveform tomography (2014, background): “These discrepancies also extend to anisotropic structure (e.g. Becker et al. 2008), which shows considerable variation across models at even long wavelengths.”
On the relationship between azimuthal anisotropy from shear wave splitting and surface wave tomography (2012, background): “In practice, we focus on the uppermost mantle where most mantle anisotropy is concentrated [e.g., Panning and Romanowicz, 2006; Kustowski et al., 2008], as expected given the formation of LPO under dislocation creep [Karato, 1992; Becker et al., 2008; Behn et al., 2009].”
Inferring upper-mantle structure by full waveform tomography with the spectral element method (2011, background): “It is not immediately apparent why the mantle wedges should have ξ larger than 1.0 when the opposite sense of anisotropy is predicted by Becker et al. (2007) based on A-type slip in olivine (alignment of fast axis with the direction of flow).”
Mantle dynamics and seismic anisotropy (2010, methodology): “Allowing for small fractions of C-type in addition to A-type LPO in flow models (Becker et al., 2008) improves the match to anisotropy dramatically (as expected from the complementary predictions for A-type vs.”
Anisotropic shear‐wave velocity structure of the Earth's mantle: A global model (2008, unknown): “served not only in our model but also in SAW642AN and in the flow model of Becker et al. [2008]. [55] We cannot rule out the presence of anisotropy in the transition zone and the middle mantle but introduction of anisotropy does not appreciably improve the fit to waveforms that are most sensitive to”
Importance of crustal corrections in the development of a new global model of radial anisotropy (2010, background): “Kinematic modeling of LPO [Kaminski and Ribe, 2001] produced through mantle flow models [e.g., Becker et al., 2008] suggest that upper mantle anisotropy can be well modeled using such an approach, but care must be taken in interpreting the results as different LPO deformation modes are possible…”
Savani: A variable resolution whole‐mantle model of anisotropic shear velocity variations based on multiple data sets (2014, methodology): “3029 with its interpretation as being caused by convective shearing of olivine in dislocation creep in the upper asthenosphere [Podolefsky et al., 2004; Becker et al., 2008; Behn et al., 2009].”