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Multiple resolution surface wave tomography: the Mediterranean basin

Boschi, L. ; Ekström, G. ; Kustowski, B.

In: Geophysical Journal International, 2004, vol. 157, no. 1, p. 293-304

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    Titre
    • Multiple resolution surface wave tomography: the Mediterranean basin
    Auteur
    • Boschi, L.. Dipartimento di Scienze Fisiche, Università Federico II, Napoli, Italy
    • Ekström, G.. Department of Earth and Planetary Sciences, Harvard University, Cambridge, MA, USA
    • Kustowski, B.. Department of Earth and Planetary Sciences, Harvard University, Cambridge, MA, USA
    Type de document
    • Postprint
    Identifiant OAI-PMH
    • oai:doc.rero.ch:292642
    Summary
    From a large set of fundamental-mode surface wave phase velocity observations, we map the transversely isotropic lateral heterogeneities in the upper-mantle shear velocity structure. We design a multiple resolution inversion procedure, which allows us to parametrize any selected region more finely than the rest of the globe. We choose, as a high-resolution region, the upper mantle underlying the Mediterranean basin. We formulate the inverse problem as in a previous paper by Boschi & Ekström, calculating regional JWKB (Jeffreys-Wentzel-Kramers-Brillouin) surface wave sensitivity kernels for each pixel of a 2°× 2° starting model, including the high-resolution global crustal map Crust 2.0. We find that the available surface wave data can resolve the most important geophysical features of the region of interest, providing a reliable image of intermediate spatial wavelength