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• W2034721395 abstract "The resolution operator is a critical accompaniment to tomographic models of the mantle. facilitates the comparison between conceptual three‐dimensional velocity models and tomographic models because it can filter these theoretical models to the spatial resolution of the tomographic model. We compute for the tomographic model S20RTS (Ritsema et al., 1999, 2004) and two companion models that are based on the same data but derived with different norm damping values. The three models explain (within measurement uncertainty) S‐SKS and S‐SKKS travel times equally well. To demonstrate how artifacts distort tomographic images and complicate model interpretation, we apply to (1) a thermochemical and (2) an isochemical model of convection in the mantle that feature different patterns of shear velocity heterogeneity in the deep mantle if we assume that shear velocity heterogeneity is caused by temperature variations only. suppresses short‐wavelength structures, removes strong velocity gradients, and introduces artificial stretching and tilting of velocity anomalies. Temperature anomalies in the thermochemical model resemble the spatial extent of low seismic velocity anomalies and the shear velocity spectrum in the D” region better than the isochemical model. However, the thermochemical model overpredicts the amplitude of shear velocity variation and places the African and Pacific anomalies imperfectly. We suspect that inaccurate velocity scaling laws and uncertain initial conditions control these mismatches. Extensive hypothesis testing is required to identify successful models." @default.
• W2034721395 created "2016-06-24" @default.
• W2034721395 creator A5032781303 @default.
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• W2034721395 date "2007-01-01" @default.
• W2034721395 modified "2023-10-14" @default.
• W2034721395 title "Tomographic filtering of geodynamic models: Implications for model interpretation and large-scale mantle structure" @default.
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• W2034721395 doi "https://doi.org/10.1029/2006jb004566" @default.
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