Shallow anisotropy in the Mediterranean mantle from surface waves

F. Marone*, S. van der Lee, D. Giardini

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

10 Scopus citations

Abstract

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.

Original languageEnglish (US)
Pages (from-to)L06624 1-4
JournalGeophysical Research Letters
Volume31
Issue number6
DOIs
StatePublished - Mar 28 2004

ASJC Scopus subject areas

  • Geophysics
  • Earth and Planetary Sciences(all)

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