HR: 17:15h
AN: S34B-06    [Abstracts]
TI: New 3D Vs model of Europe and the Mediterranean Basin
AU: * Fry, B
EM: bill.fry@erdw.ethz.ch
AF: Institute for Geophysics ETH-Zurich, ETH-Hoenggerberg HPP 013, Zurich, ZH 8093, Switzerland
AU: Boschi, L
EM: larryboschi@gmail.com
AF: Institute for Geophysics ETH-Zurich, ETH-Hoenggerberg HPP 013, Zurich, ZH 8093, Switzerland
AU: Ekstrom, G
EM: ekstrom@ldeo.columbia.edu
AF: LDEO Columbia University, 61 Route 9W - PO Box 1000, Palisades, NY 10964-8000, United States
AU: Giardini, D
EM: domenico.giardini@sed.ethz.ch
AF: Institute for Geophysics ETH-Zurich, ETH-Hoenggerberg HPP 013, Zurich, ZH 8093, Switzerland
AB: We invert a dense dataset of teleseismic and regional phase velocity observations for global 3-dimensional radially anisotropic shear velocity structure of the upper mantle. Our algorithm finds the least squares solution of the linear inverse problem by Cholesky factorization of the ATA matrix. We parameterize the model with a series of latitudinal, longitudinal, and radial splines. Multiple resolution parameterization allows us to discretize Europe and the Mediterranean with a higher density of splines than elsewhere, thereby utilizing the dense data coverage within the region. By using a this parameterization, we decrease the risk of erroneously mapping external anomalies into our high-density region. We calculate our sensitivity kernels iteratively, starting with 1D kernels based on a combined Crust 2.1 and PREM starting model. The velocity model resulting from inversion with the first kernels is then used to recalculate kernels for the subsequent inversion. We will present the resulting SV and SH models. Key advancements over previous models include increased resolution and improved imaging of key tectonic features such as continuous fast velocities below the Aegean Arc and Alpine Orogeny.
DE: 7208 Mantle (1212, 1213, 8124)
DE: 7218 Lithosphere (1236)
DE: 7240 Subduction zones (1207, 1219, 1240)
DE: 7255 Surface waves and free oscillations
DE: 7270 Tomography (6982, 8180)
SC: Seismology [S]
MN: 2007 Fall Meeting