Computer Science – Sound
Scientific paper
Jun 2011
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2011georl..3812303d&link_type=abstract
Geophysical Research Letters, Volume 38, Issue 12, CiteID L12303
Computer Science
Sound
4
Seismology: Mantle (1212, 1213, 8124), Seismology: Tomography (6982, 8180)
Scientific paper
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 V$\phi$ 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.
Boschi Lapo
Della Mora S.
Giardini Domenico
Nakagawa Takao
Tackley Paul J.
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