Low seismic resolution cannot explain S/P decorrelation in the lower mantle
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Date
2011-06
Publication Type
Journal Article
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yes
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Abstract
Inverted models of the deep mantle show a decorrelation between maps of shear Vₛ and compressional Vₚ wave velocities, an anti-correlation between the bulk sound velocity Vϕ and Vₛ and a much larger variability of Vₛ with respect to Vₚ, expressed by large values of the ratio of their relative lateral variations. We carried out synthetic tests to verify if these features could be artifacts, explained by limits in tomographic resolution: synthetic data are calculated for an “input” model, and linearly inverted, as in tomography, to find an “output” model. Comparing the values of the aforementioned parameters for two different chemically homogeneous input models with the associated reconstructed output ones, we found that artifacts caused by realistic data noise and the nonuniform distribution of seismic sources and stations over the globe are not sufficient to introduce the features previously described. We confirm that compositional effects are required to explain them.
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published
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Journal / series
Volume
38
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Publisher
American Geophysical Union
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Subject
Deep mantle; Resolution; Seismology; Tomography
Organisational unit
03476 - Giardini, Domenico / Giardini, Domenico
03698 - Tackley, Paul / Tackley, Paul