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  • 04. Solid Earth::04.06. Seismology::04.06.07. Tomography and anisotropy  (10)
  • 04. Solid Earth::04.01. Earth Interior::04.01.99. General or miscellaneous  (3)
  • Lithosphere-Astenosphere Interactions  (3)
  • 9335
  • TF III
Collection
Keywords
Publisher
Years
  • 1
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    Active stress map of Italy (1999)
    In:  J. Geophys. Res., Edmonton, Conseil de l'Europe, vol. 104, no. B11, pp. 25,595-25,610, pp. B10404, (ISSN: 1340-4202)
    Details
    Publication Date: 1999
    Keywords: Stress ; Fault plane solution, focal mechanism ; Borehole breakouts ; 8164 ; Tectonophysics ; Stresses--crust ; and ; lithosphere ; 7230 ; Seismology ; Seismicity ; and ; seismotectonics ; 1744 ; History ; of ; geophysics ; JGR ; Tectonophysics ; 9335 ; Information ; related ; to ; geographic ; region ; Europe
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    BIBLIOGRAPHY SEISMOLOGY
  • 2
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    SKS splitting measurements and modelling in the key of a complex structures beneath Northern Apennines region. Workshop Meeting in Seismic Anisotropy and Geodynamics of the Lithosphere-Asthenosphere System (2006)
    In:  Trest, Czech Republic
    Details
    Publication Date: 2006
    Keywords: TF III ; Task Force III ; Lithosphere-Astenosphere Interactions
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    BIBLIOGRAPHY ILP
  • 3
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    Receiver Functions And Anisotropy in the Northern Apennines. Workshop Meeting in Seismic Anisotropy and Geodynamics of the Lithosphere-Asthenosphere System (2006)
    In:  Trest, Czech Republic
    Details
    Publication Date: 2006
    Keywords: TF III ; Task Force III ; Lithosphere-Astenosphere Interactions
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    BIBLIOGRAPHY ILP
  • 4
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    Shear wave splitting measurements in the Northern Apennines: results from RETREAT′s project. Workshop Meeting in Seismic Anisotropy and Geodynamics of the Lithosphere-Asthenosphere System (2006)
    In:  Trest, Czech Republic
    Details
    Publication Date: 2006
    Keywords: TF III ; Task Force III ; Lithosphere-Astenosphere Interactions
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    BIBLIOGRAPHY ILP
  • 5
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    Seismic Anisotropy beneath Northern Victoria Land from SKS Splitting Analysis (2005)
    Springer-Verlag, Berlin Heidelberg New York
    Details
    Publication Date: 2017-04-04
    Description: Abstract. Teleseismic data recorded by temporary and permanent stations located in the Northern Victoria Land region are analysed in order to identify the presence and location of seismic anisotropy. We work on data recorded by 24 temporary seismographic stations deployed between 1993 and 2000 in different zones of the Northern Victoria Land, and by the permanent very broad-band stations TNV located near the Italian Base M. Zucchelli. The temporary networks monitored an area extending from Terra Nova Bay towards the South beyond the David Glacier and up to the Indian Ocean northward. To better constrain our study, we also provide an analysis of data recorded by TNV in the same period of time and we take into account also SKS shear wave splitting measurements performed by Barruol and Hoffman (1999) on data recorded by DRV. This study, to be considered as preliminary, reveals the presence of seismic anisotropy below the study region, with a mainly NW-SE fast velocity direction below the Terra Nova Bay area and rather large delay times, that mean a deep rooted anisotropic layer.
    Description: Published
    Description: 153-160
    Description: open
    Keywords: Seismic anisotropy ; Antarctica ; 04. Solid Earth::04.01. Earth Interior::04.01.99. General or miscellaneous
    Repository Name: Istituto Nazionale di Geofisica e Vulcanologia (INGV)
    Type: book chapter
    Format: 783740 bytes
    Format: application/pdf
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  • 6
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    Seismic Anisotropy Analysis in the Victoria Land Region (Antarctica) (2010)
    Details
    Publication Date: 2017-04-04
    Description: We present shear-wave splitting results obtained from analysis of core refracted teleseismic phases recorded by permanent and temporary seismographic stations located in the Victoria Land region (Antarctica). We used eigenvalue technique to linearize the rotated and shifted shear-wave particle motion, in order to determine the best splitting parameters. A well-scattered distribution of single shear-wave measurements has been obtained. Average values show clearly that dominant fast axis direction is NE-SW oriented, accordingly with previous measurements obtained around this zone. Only two stations, OHG and STAR show different orientations, with N-S and NNW-SSE main directions. On the basis of the periodicity of single shear-wave splitting measurements with respect to back-azimuths of events under study, we inferred the presence of lateral and vertical changes in the deep anisotropy direction. To test this hypothesis we have modelling waveforms using a cross-convolution technique in one and two anisotropic layer's cases. We obtained a significant improvement on the misfit in the double layer case for the cited couple of stations. For stations where a multi-layer structure does not fit, we looked for evidences of lateral anisotropy changes at depth through Fresnel zone computation. As expected, we find that anisotropy beneath the Transantarctic Mountains (TAM) is considerably different from that beneath the Ross Sea. This feature influences the measurement distribution for the two permanent stations TNV and VNDA. Our results show a dominant NE-SW direction over the entire region, but other anisotropy directions are present and find an interpretation when examined in the context of regional tectonics.
    Description: Submitted
    Description: 3.3. Geodinamica e struttura dell'interno della Terra
    Description: JCR Journal
    Description: open
    Keywords: Antarctica ; Shear-wave splitting ; Seismic Anisotropy ; Mantle processes ; 04. Solid Earth::04.06. Seismology::04.06.07. Tomography and anisotropy
    Repository Name: Istituto Nazionale di Geofisica e Vulcanologia (INGV)
    Type: manuscript
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  • 7
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    The Subduction Structure of the Northern Apennines: Results from the RETREAT Seismic Deployment (2007)
    Details
    Publication Date: 2017-04-04
    Description: The project Retreating-trench, extension, and accretion tectonics, RETREAT, is a multidisciplinary study of the Northern Apennines (www.geology.yale.edu/RETREAT/index.htm), is funded by the United States National Science Foundation (NSF) in collaboration with the Italian Istituto Nazionale di Geofisica e Vulcanologia (INGV) and the Grant Agency of the Czech Academy of Sciences (GAAV). The main goal of RETREAT is to develop a self-consistent dynamic model of syn-convergent extension, using the Northern Apennines as a natural laboratory. In the context of this project a passive seismological experiment was deployed in the fall of 2003 for a period of three years. RETREAT seismologists aim to develop a comprehensive understanding of the deep structure beneath the Northern Apennines, with particular attention on inferring likely patterns of mantle flow. Specific objectives of the project are the crustal and lithospheric thicknesses, the location and geometry of the Adriatic slab, and the distribution of seismic anisotropy laterally and vertically in the lithosphere and asthenosphere. The project is collecting teleseismic and regional earthquake data for 3 years. This contribution describes the RETREAT seismic deployment and reports on key results from the first year of the deployment. We confirm some prior findings regarding the seismic structure of central Italy, but our observations also highlight the complexity of the Northern Apennines subduction system.
    Description: Submitted
    Description: open
    Keywords: Apennines: ; Seismic ; 04. Solid Earth::04.01. Earth Interior::04.01.99. General or miscellaneous
    Repository Name: Istituto Nazionale di Geofisica e Vulcanologia (INGV)
    Type: manuscript
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  • 8
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    The Italian CMT dataset from 1977 to present (2007)
    Elsevier
    Details
    Publication Date: 2017-04-04
    Description: The INGV-Harvard European-Mediterranean Regional Centroid Moment Tensor (RCMT) Catalog collects solutions routinely computed since 1997 for earthquakes with moderate magnitude (4.5 ≤ M ≤ 5.5) in the Mediterranean region. The database represents an extension to smaller magnitudes of the Harvard global CMT catalog, based on analysis of seismograms recorded at regional distance, and modeling of intermediate period surface waves. The catalog includes about 600 events, 200 of which in the Italian region. This study extends the catalog back in time, for the Italian region, as long as made possible by available digital data – i.e. since 1977 – with the same analysis and inversion method used for current seismicity. As a result, we present here 65 new moment tensors, for years between 1977 and 1997. These solutions represent 45% of the total number of events analyzed, the existing seismograms being often too scarce to allow a stable solution. The new dataset includes events in many seismic zones where moderate seismicity had previously been scarcely documented, e.g., the Po Plain, the Central to Southern Apennines and the Adriatic Sea. The complete dataset, including previously determined RCMTs and CMTs, represents the seismic deformation in the Italian area during the last 25 years.
    Description: Published
    Description: 286-303
    Description: JCR Journal
    Description: reserved
    Keywords: Seismicity ; Moment tensors ; Seismic deformation ; Italian region ; 04. Solid Earth::04.06. Seismology::04.06.07. Tomography and anisotropy
    Repository Name: Istituto Nazionale di Geofisica e Vulcanologia (INGV)
    Type: article
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  • 9
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    Seismic Anisotropy in the Victoria Land Region (Antarctica) (2010)
    Details
    Publication Date: 2017-04-04
    Description: We present shear-wave splitting results obtained from analysis of core refracted teleseismic phases recorded by permanent and temporary seismographic stations located in the Victoria Land region (Antarctica). We used eigenvalue technique to linearize the rotated and shifted shear-wave particle motion, in order to determine the best splitting parameters. A well-scattered distribution of single shear-wave measurements has been obtained. Average values show clearly that dominant fast axis direction is NE-SW oriented, accordingly with previous measurements obtained around this zone. Only two stations, OHG and STAR show different orientations, with N-S and NNW-SSE main directions. On the basis of the periodicity of single shear-wave splitting measurements with respect to back-azimuths of events under study, we inferred the presence of lateral and vertical changes in the deep anisotropy direction. To test this hypothesis we have modelling waveforms using a cross-convolution technique in one and two anisotropic layer's cases. We obtained a significant improvement on the misfit in the double layer case for the cited couple of stations. For stations where a multi-layer structure does not fit, we looked for evidences of lateral anisotropy changes at depth through Fresnel zone computation. As expected, we find that anisotropy beneath the Transantarctic Mountains (TAM) is considerably different from that beneath the Ross Sea. This feature influences the measurement distribution for the two permanent stations TNV and VNDA. Our results show a dominant NE-SW direction over the entire region, but other anisotropy directions are present and find an interpretation when examined in the context of regional tectonics.
    Description: Submitted
    Description: 3.3. Geodinamica e struttura dell'interno della Terra
    Description: N/A or not JCR
    Description: open
    Keywords: Antarctica ; Seismic Anisotropy ; 04. Solid Earth::04.06. Seismology::04.06.07. Tomography and anisotropy ; 04. Solid Earth::04.06. Seismology::04.06.10. Instruments and techniques ; 04. Solid Earth::04.07. Tectonophysics::04.07.99. General or miscellaneous
    Repository Name: Istituto Nazionale di Geofisica e Vulcanologia (INGV)
    Type: manuscript
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  • 10
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    Large-scale coherent anisotropy of upper mantle beneath the Italian peninsula comparing quasi-Love waves and SKS splitting (2015)
    Elsevier Science Limited
    Details
    Publication Date: 2017-04-04
    Description: We document quantitatively observations of quasi-Love waves obtained at permanent (Italian National Seismic Network) and temporary seismic stations deployed in Italy between 2003 and 2006 (Retreat, CAT/SCAN projects). We analyzed large earthquakes with source parameters that favor quasi-Love wave generation within this time-span, including the Sumatra–Andaman earthquake of 12/26/04. The presence or the absence of the quasi-Love phase is compared to the smoothed anisotropic pattern defined by the numerous SKS splitting measurements obtained in peninsular Italy, and to the Italian upper mantle structure as defined by seismic tomography. The large-scale anisotropic features, responsible for shear-wave splitting and documented also by Pn and surface-wave anisotropy, generally display the correct geometry to explain the scattered quasi-Love waves. Quasi-Love observations do not demand a tilted-axis anisotropic geometry. We argue instead for anisotropy with laterally-variable horizontal symmetry axis in the upper mantle below the Italian peninsula.
    Description: Published
    Description: 26-38
    Description: 1T. Geodinamica e interno della Terra
    Description: JCR Journal
    Description: restricted
    Keywords: Seismic anisotropy ; Quasi-Love ; Italy ; 04. Solid Earth::04.01. Earth Interior::04.01.02. Geological and geophysical evidences of deep processes ; 04. Solid Earth::04.06. Seismology::04.06.07. Tomography and anisotropy ; 04. Solid Earth::04.07. Tectonophysics::04.07.06. Subduction related processes
    Repository Name: Istituto Nazionale di Geofisica e Vulcanologia (INGV)
    Type: article
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