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  • 1
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    Teleseismic P-residual study in the Italian region - inferences on large scale anisotropic structure of the subcrustal lithosphere (2006)
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    Publication Date: 2019-11-04
    Description: Jeffreys-Bullen (absolute) and relative P-wave travel-time residuals were analyzed over Italy and its surrounding using P arrival times from the ISC bulletins supplemented by the data from local observatories. We analyzed the travel-time station corrections by two independent methods to obtain information on lateral variations of the velocity structure over the area and a view of possible upper mantle anisotropy. In the first method, the station corrections are computed as a constant and two cosine terms with appropriate phase shifts. Besides a static term, the second method allows us to study the relative residuals in dependence both on azimuths and incidence angles and thus to investigate their spatial variations and to map lateral variations of anisotropic structure of the subcrustal lithosphere. The high and low-velocity directions inferred from the spatial distribution of the relative residuals as well as the high- and low-velocity upper mantle heterogeneities reflect the geodynamic development of the region, governed by the collision between the African and Eurasian plates
    Description: JCR Journal
    Description: open
    Keywords: teleseismic P residual ; lateral variations of mean residual ; azimuth and spatial variations of the residuals ; 3D anisotropic structure ; subcrustal lithosphere ; 04. Solid Earth::04.06. Seismology::04.06.09. Waves and wave analysis
    Repository Name: Istituto Nazionale di Geofisica e Vulcanologia (INGV)
    Type: article
    Format: 5922536 bytes
    Format: application/pdf
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  • 2
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    Seismic anisotropy in tomographic studies of the upper mantle beneath Southern Europe (2006)
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    Publication Date: 2019-11-04
    Description: Regional seismic tomography of Iberia, Italy, the South Balkans and the Aegean region down to about 400 km are discussed along with results of studies on the anisotropic structure of the lithosphere based on an analysis of spatial variations of P-residuals. The P-residual spheres, showing azimuth-incidence angle dependent terms of relative residuals, map lateral changes of the anisotropic structure of the subcrustal lithosphere related to large tectonic units. Isotropic velocity perturbation models correlate, in general, with models of the lithosphere thickness but in some provinces they are affected by neglecting the anisotropic propagation within the lithosphere.
    Description: JCR Journal
    Description: open
    Keywords: subcrustal lithosphere ; upper mantle heterogeneities ; seismic anisotropy ; velocity perturbation ; residual spheres ; 04. Solid Earth::04.06. Seismology::04.06.07. Tomography and anisotropy
    Repository Name: Istituto Nazionale di Geofisica e Vulcanologia (INGV)
    Type: article
    Format: 3791692 bytes
    Format: application/pdf
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