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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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    Publikationsdatum: 2019-11-04
    Beschreibung: 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
    Beschreibung: JCR Journal
    Beschreibung: open
    Schlagwort(e): 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)
    Materialart: article
    Format: 5922536 bytes
    Format: application/pdf
    Standort Signatur Einschränkungen Verfügbarkeit
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  • 2
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    Underground earth strain and seismic radiation measurements with a laser interferometer and a dense small-aperture seismic array (2006)
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    Publikationsdatum: 2019-11-04
    Beschreibung: This paper describes two geophysical instruments, installed in the underground physics laboratories of Gran Sasso (LNGS-INFN), located in the seismic zone of the Central Apennines, Italy. These instruments monitor strain and seismic radiation with very high sensitivity: one is a 90 m-long laser interferometer, sensitivity 3 x 10-12, frequency response 10-7-10-2 Hz, and has been operating since 1994. The other is a small-aperture seismic array composed of 21 three-component short period (Mark L4C-3D) and 3 broadband (Guralp CMG-3ESP) seismometers. This dense array will be in operation at the beginning of 1998.
    Beschreibung: JCR Journal
    Beschreibung: open
    Schlagwort(e): strain ; seismic array ; seismometry ; 04. Solid Earth::04.06. Seismology::04.06.10. Instruments and techniques
    Repository-Name: Istituto Nazionale di Geofisica e Vulcanologia (INGV)
    Materialart: article
    Format: 3637283 bytes
    Format: application/pdf
    Standort Signatur Einschränkungen Verfügbarkeit
    BibTip Andere fanden auch interessant ...
    ARTIKEL (OA)
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