Abstract
A new finite-frequency shear-velocity model of the European-Mediterranean region
Institute of Geophysics, ETH Zurich, Zurich, Switzerland
Institute of Geophysics, ETH Zurich, Zurich, Switzerland
Institute of Geophysics, ETH Zurich, Zurich, Switzerland
Institute of Geophysics, ETH Zurich, Zurich, Switzerland
Lamont-Doherty Earth Observatory, Earth Institute at Columbia University, Palisades, New York, USA
Institute of Geophysics, ETH Zurich, Zurich, Switzerland
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.
Received 22 May 2008; accepted 25 July 2008; published 30 August 2008.
Citation: (2008), A new finite-frequency shear-velocity model of the European-Mediterranean region, Geophys. Res. Lett., 35, L16315, doi:10.1029/2008GL034769.
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