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- W2100096772 abstract "A widely held belief is that anelasticity can contribute significantly to seismic wave-speed variations in the lower mantle. In particular it has been argued that anelasticity can strongly increase the sensitivity of VS to temperature, and that anelasticity may also increase VS relative to VP (as measured by the parameter RS/P = dlnVS/dlnVP). If true, this could significantly reduce or, in some cases, eliminate the need to explain seismic signals in the mantle with chemical heterogeneity, and that most of the variation in seismic velocities in the lower mantle could be attributed to temperature alone. We re-visit this view and find that a strong anelastic effect is unlikely in the Earth's lower mantle. Given the present knowledge of the properties of perovskite under lower mantle conditions, we find it unlikely that anelasticity can affect dlnVS/dT by more than about 30%, and it is most likely less than 20%. We also find that the probable upper bound on dlnVS/dlnVP due to thermal variations is about 1.8 in the shallow lower mantle, and about 2.1 in the deeper lower mantle. We conclude, therefore, that anelasticity cannot be invoked to significantly reduce or remove interpretations of lower mantle chemical heterogeneity based on large-scale seismic wave-speed variations." @default.
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- W2100096772 date "2007-10-01" @default.
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- W2100096772 title "Chemical versus thermal heterogeneity in the lower mantle: The most likely role of anelasticity" @default.
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- W2100096772 doi "https://doi.org/10.1016/j.epsl.2007.07.054" @default.
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