Geodynamic Significance of Seismic Anisotropy of the Upper Mantle: New Insights from Laboratory Studies

By S. Karato, H. Jung, I. Katayama, P. Skemer. 2008

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View Paper: https://www.semanticscholar.org/paper/529b3d9de92255d073e63839906b80db2075b93b

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Citations in the corpus

Upper mantle seismic anisotropy resulting from pressure-induced slip transition in olivine (2009, background): “A controversy has ensued because it has not been demonstrated to the satisfaction of the community that the more recent experiments were both dry and conducted under sufficiently low stresses to be relevant to interpretation of the Eart”
Rheology of the Earth's mantle: A historical review (2010, background): “Contribution from this artifact often complicates the interpretation of deformation microstructures (Holtzman et al., 2003b; Karato et al., 2008).”
Mantle dynamics and seismic anisotropy (2010, background): “When an aggregate of olivine is deformed in simple shear in the dislocation creep regime, it will develop an LPO, with the strength of LPO increasing with increasing strain until it saturates at a relativelymodest amount of strain (~100–150%, e.g., Karato et al., 2008).”
Shear Wave Splitting and Mantle Anisotropy: Measurements, Interpretations, and New Directions (2009, background): “Recent mineral physics results indicate that anisotropic fabric can be affected by the stress, temperature, and pressure conditions and by volatile content (e.g., Jung and Karato 2001; Mainprice 2007; Karato et al. 2008; Jung et al. 2009).”
Shearing Melt Out of the Earth: An Experimentalist's Perspective on the Influence of Deformation on Melt Extraction (2009, background): “Based on the shear-a-normal fabrics produced in direct shear experiments on partially molten samples, the relevance of these results to the Earth has been questioned as an “experimental artifact” that “does not apply to natural settings” (Karato et al. 2007).”
An anisotropic shear velocity model of the Earth's mantle using normal modes, body waves, surface waves and long-period waveforms (2014, background): “…in the Earth, either by the crystallographic or lattice preferred orientation (CPO, LPO) of anisotropic minerals or by the shape preferred orientation (SPO) of distinct isotropic materials such as in partial melt (Nicolas & Christensen 1987; Karato 1992; Mainprice et al. 2000; Karato et al. 2008).”
Joint seismic-geodynamic-mineral physical modelling of African geodynamics: A reconciliation of deep-mantle convection with surface geophysical constraints (2010, background): “Additional complicating factors may be the presence of hydrated minerals and the generation of partial melts in zones of strong asthenospheric upwelling, as discussed in Karato et al. (2008).”
Radial seismic anisotropy as a constraint for upper mantle rheology (2007, methodology): “Synthetic deformation experiments for C and E-type slip-systems with the choicesofTable 3 yieldedanisotropyestimates thatareconsistent with the independent calculations by Karato et al. (in press) .I n”
Joint inversion for global isotropic and radially anisotropic mantle structure including crustal thickness perturbations (2015, background): “Since different minerals have different slip directions that depend on temperature, pressure, and water content [e.g., Jung and Karato, 2001; Karato et al., 2008], the interpretation of observations of seismic anisotropy relies on experimental results from mineral physics.”
Inferring upper-mantle structure by full waveform tomography with the spectral element method (2011, background): “However, because the dominant slip systems that give rise to LPO are themselves sensitive to temperature, pressure, strain-rate and volatile-content, a variety of slip systems might be operative in the upper mantle, complicating the interpretation of anisotropy (see Karato et al. 2008).”
Rheology of the Lower Crust and Upper Mantle: Evidence from Rock Mechanics, Geodesy, and Field Observations (2008, background): “In addition to providing information on the distribution of strain, the existence of a preferred lattice orientation in the upper ∼200 km of the mantle also suggests that deformation to that depth likely occurs primarily by dislocation creep (Karato et al. 2008).”
On the origin of the asthenosphere (2012, result): “dicted by this model is (VSH−VSV)/〈VS〉~2–5%) (Karato et al., 2008).”