Origin of lateral variation of seismic wave velocities and density in the deep mantle

By S. Karato, Bijaya B. Karki. 2001

310 citations recorded by the source corpus.

Subfields: Geophysics, Ocean Engineering

View Paper: https://www.semanticscholar.org/paper/e59553a45672d6d1262ec873424fd9b83c2d2806

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In Ocean Engineering

Citations in the corpus

TX2019slab: A New P and S Tomography Model Incorporating Subducting Slabs (2019, methodology): “…to determine the compositional state of the Earth's mantle, especially in the deeper mantle (e.g., Della Mora et al., 2011; Houser et al., 2008; Karato & Karki, 2001; Koelemeijer et al., 2016; Masters et al., 2000; Robertson & Woodhouse, 1996; Saltzer et al., 2001; Tesoniero et al., 2016).”
High‐pressure elastic properties of major materials of Earth's mantle from first principles (2001, background): “Thermal anomalies alone appear unable to account for the observed seismic heterogeneity at the bottom of the lower mantle [Karato and Karki, 2001].”
Global mantle flow and the development of seismic anisotropy: Differences between the oceanic and continental upper mantle (2007, methodology): “For density-driven flow, we employ rigid surface boundary conditions and assign densities in the mantle by converting velocity anomalies in the S20RTSb seismic tomography model [Ritsema et al., 2004] to densities using a constant velocity-density conversion factor of 0.15 g cm � 3 km � 1 s. We chose”
Constraints on lithosphere net rotation and asthenospheric viscosity from global mantle flow models and seismic anisotropy (2010, methodology): “…in the S20RTSb seismic tomography model [Ritsema et al., 2004] to densities using a constant velocity‐density conversion factor of 0.15 g cm−3 km−1 s, which is consistent with both laboratory data [e.g., Karato and Karki, 2001] and previous studies [e.g., Behn et al., 2004; Conrad et al., 2007].”
The effect of temperature on the seismic anisotropy of the perovskite and post-perovskite polymorphs of MgSiO 3 (2004, background): “The ratio of lateral variation of compressional to shear wave velocities has been estimated from seismic observations and provides a constraint on the composition of the lower mantle [56,57].”
Dynamics and evolution of the deep mantle resulting from thermal, chemical, phase and melting effects (2012, background): “…Dziewonski, 1997; Antolik et al., 2003; Kennett and Gorbatov, 2004; Saltzer et al., 2004), and the amplitude ratio between S- and P-wave velocity anomalies becomes large in the deep mantle (Robertson and Woodhouse, 1996; Masters et al., 2000; Karato and Karki, 2001; Ritsema and Van Heijst, 2002).”
Grain-size-sensitive seismic wave attenuation in polycrystalline olivine (2002, background): “Moreover, average derivatives for finite temperature intervals will be larger at high temperature than at lower temperature [Karato and Karki, 2001].”
On the statistical distribution of seismic velocities in Earth's deep mantle (2008, background): “However, Karato and Karki (2001) find that below about 2000-2300 km depth another non-thermal contribution to lateral variations in VS is likely necessary and cannot be explained by the combined anharmonic and anelastic effects, in good agreement with the depth of onset for the low VS tail in the…”
The many surface expressions of mantle dynamics (2010, background): “Much work has also been devoted to better understanding the nature of the seismic anomalies we detect in the mantle, that is whether they correspond to temperature or compositional anomalie”
Thermodynamics of mantle minerals – I. Physical properties (2005, background): “Knowledge of the shear wave velocity of Ca-perovskite is essential for evaluating the seismic visibility of Ca as a chemical component in the lower mantle and its potential influence on radial and lateral structure (Karato & Karki 2001).”