Physics
Scientific paper
Aug 2008
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2008georl..3516315p&link_type=abstract
Geophysical Research Letters, Volume 35, Issue 16, CiteID L16315
Physics
5
Seismology: Surface Waves And Free Oscillations, Seismology: Mantle (1212, 1213, 8124), Seismology: Theory, Seismology: Tomography (6982, 8180)
Scientific paper
We invert a global phase-anomaly database of intermediate- to long-period Rayleigh waves, recently updated with increased coverage in the European-Mediterranean region, on a global scale with a higher resolution parameterization in the region of interest. We first compare phase-velocity inversions based on ray and finite-frequency theory and derive for each a corresponding set of local phase-velocity dispersion curves (one per model pixel) between 35 s to 300 s period. Effects of the two different theories on the three-dimensional upper-mantle structure are investigated by inverting each dispersion curve for radial shear-velocity profiles. The combination of a gradient-descent method and a random-Monte-Carlo model search provides an estimated shear-velocity model with associated uncertainties for depths between 40 km to 400 km. While differences between ray-theoretical and finite-frequency models are small compared to model uncertainty, comparisons with independent models favor the finite-frequency one.
Boschi Lapo
Deschamps Frédéric
Ekström Göran
Fry Brian
Giardini Domenico
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