Physics
Scientific paper
Mar 2004
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2004georl..3106624m&link_type=abstract
Geophysical Research Letters, Volume 31, Issue 6, CiteID L06624
Physics
3
Seismology: Lithosphere And Upper Mantle, Seismology: Surface Waves And Free Oscillations, Tectonophysics: Plate Boundary-General (3040), Tectonophysics: Tomography
Scientific paper
We present new evidence for the existence of the Love-Rayleigh discrepancy in the Mediterranean region and constrain the average polarization anisotropic structure of the Mediterranean mantle. We analysed regional Rayleigh and Love waveforms recorded at 3-component broadband seismic stations. None of the 3-component seismograms could be fit with a single 1D isotropic and smooth velocity model. However, satisfactory fits for individual Rayleigh and Love waveforms could often be obtained using realistic 1D velocity models. We used these 1D path-average velocity structures to derive 3D S-velocity models for the Mediterranean region. Our results show that Love waves require higher velocities (about 200 m/s) compared to Rayleigh waves between 30 and 120 km depth. We relate the observed anisotropy to lattice-preferred orientation of crystallographic axes of elastically anisotropic minerals such as olivine.
Giardini Domenico
Marone Federica
van der Lee Suzan
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