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  • 04. Solid Earth::04.03. Geodesy::04.03.99. General or miscellaneous  (8)
  • 1
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    Coastal structure, sea-level changes and vertical motion of the land in the Mediterranean (2014)
    Geological Society Publishing House
    Details
    Publication Date: 2021-06-03
    Description: The Mediterranean basin is an important area of the Earth for studying the interplay between geodynamic processes and landscape evolution affected by tectonic, glacio-hydro-isostatic and eustatic factors. We focus on determining vertical deformations and relative sea-level change of the coastal zone utilizing geological, archaeological, historical and instrumental data, and modelling. For deformation determinations on recent decadal to centennial time scales, seismic strain analysis based on about 6000 focal mechanisms, surface deformation analysis based on some 850 continuous GPS stations, and 57 tide gauge records were used. Utilizing data from tectonically stable areas, reference surfaces were established to separate tectonic and climate (eustatic) signals throughout the basin for the last 20 000 years. Predominant Holocene subsidence (west coast of Italy, northern Adriatic sea, most of Greece and Turkey are areas at risk of flooding owing to relative sea-level rise), uplift (local areas in southwestern Italy and southern Greece) or stability (northwestern and central western Mediterranean and Levant area) were determined. Superimposed on the long trends, the coasts are also impacted by sudden extreme events such as recurring large storms and numerous, but unpredictable tsunamis caused by the high seismicity of parts of the basins.
    Description: Published
    Description: 1T. Geodinamica e interno della Terra
    Description: N/A or not JCR
    Description: restricted
    Keywords: Mediterranean, sea level, seismicity, tsunami, GPS ; 04. Solid Earth::04.03. Geodesy::04.03.99. General or miscellaneous
    Repository Name: Istituto Nazionale di Geofisica e Vulcanologia (INGV)
    Type: article
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  • 2
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    Data Analysis of Permanent GPS networks in Italy (2009)
    Details
    Publication Date: 2017-04-04
    Description: Starting from 2004, the Istituto Nazionale di Geofisica e Vulcanologia (INGV) set up a dense GPS network, called RING (Rete Integrata Nazionale GPS) in Italy in order to improve the knowledge of the geodynamics and tectonic processes. Due to the complexity of the tectonic behaviour in the area, the INGV also arranged the data analysis of all the permanent sites available in the Italian region. We will present time series and velocity fields obtained with two different processing software (GAMIT and BERNESE), analyzing the complete data set from 1998 to 2008 of over 300 sites. The processing is performed adopting a distributed session approach, with more than 10 clusters, sharing common stations, each of them consisting of about 40 stations. Daily loosely constrained solutions are routinely produced for each cluster and the velocity fields are obtained by stacking the daily normal equations rigorously. Residuals and differences between the two solutions will be presented and discussed. The comparison of the two geodetic solutions is an important tool to validate the results and to isolate systematic errors induced by the analysts and it is the first step to obtain a consensus solution of the Italian region.
    Description: Unpublished
    Description: Vienna - Austria
    Description: 1.9. Rete GPS nazionale
    Description: open
    Keywords: GPS ; Italian Permanent Networks ; RING ; 04. Solid Earth::04.03. Geodesy::04.03.99. General or miscellaneous
    Repository Name: Istituto Nazionale di Geofisica e Vulcanologia (INGV)
    Type: Poster session
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  • 3
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    Convergence vs. retreat in Southern Tyrrhenian Sea: Insights from kinematics (2005)
    Details
    Publication Date: 2017-04-04
    Description: The Tyrrhenian Sea is an extensional basin opened by trench retreat and back-arc extension during subduction of the Calabrian slab in the last 10–12 My. Subduction is still active beneath the SEmost part of the Tyrrhenian Sea, as testified by seismicity down to 500 km depth. By analyzing seismicity and geodetic data, together with recent tomographic images, we define the present-day situation. An evident N-S compressional regime prevails in the Tyrrhenian region west of the Aeolian archipelago, while east of them a NNW-SSE extension is documented by focal mechanisms and GPS data, with a much smaller strain rate with respect to the past. The transition between these two domains is accommodated by a N-S discontinuity zone which runs from Aeolian Islands to Mt. Etna with an extensional to strike-slip deformation.
    Description: Published
    Description: (L06611
    Description: partially_open
    Keywords: Geodesy and Gravity ; Seismic deformations ; Earthquake parameters ; Plate motions present and recent ; 04. Solid Earth::04.03. Geodesy::04.03.99. General or miscellaneous
    Repository Name: Istituto Nazionale di Geofisica e Vulcanologia (INGV)
    Type: article
    Format: 1749406 bytes
    Format: application/pdf
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  • 4
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    Present day kinematics of Italy (2012)
    Details
    Publication Date: 2017-04-03
    Description: We present the velocity field of Italy derived from the analysis of continuous GPS observations collected during 1998-2009 from 287 sites. The GPS networks analyzed cover the whole country with a mean inter-site distance of about 50 km. The processing is performed using two software programs, BERNESE and GAMIT, adopting in both cases a distributed session approach with more than 10 clusters, sharing common stations, each of them consisting of about 40 stations. Daily loosely constrained solutions (saved as SINEX files) are routinely produced for each cluster by two data analysis centres and the velocity field is obtained by stacking the daily normal equations. The rigorous combination of independent solutions allows the cross-validation of the velocity field. We have analyzed the time series of the entire area referenced to a common frame (ITRF2005 with respect to Eurasian Plate) and have estimated the velocity field providing an updated detailed picture of the kinematics (velocity map) and deformation pattern (strain rate map) of the Italian area. Additionally, we have combined the two velocity fields obtained from the two software programs obtaining the average velocity field of the Italian area. The two velocity fields agree at the level of 0.2-0.3 mm/yr consistent with their standard deviations. The deformation patterns (strain-rates) do have significant features, showing a distinctive extension along the Apennines on the order of 50-80 10-9 yr-1 and less pronounced areas of compressive tectonic behaviour at the level of 30-50 10-9 yr-1. The GPS kinematic description of the crustal deformation shows a high coherence with the seismotectonic setting of the Italian area.
    Description: This research has benefited from funding provided by the Italian Presidenza del Consiglio dei Ministri - Dipartimento della Protezione Civile (DPC) within the INGVDPC 2007-2009 agreement (project S1)
    Description: Published
    Description: paper 2
    Description: 3.3. Geodinamica e struttura dell'interno della Terra
    Description: N/A or not JCR
    Description: restricted
    Keywords: Italian area ; GPS ; velocity field ; kinematics ; 04. Solid Earth::04.03. Geodesy::04.03.99. General or miscellaneous
    Repository Name: Istituto Nazionale di Geofisica e Vulcanologia (INGV)
    Type: article
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  • 5
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    Toward a dense italian GPS velocity field: data analysis strategies and quality assessment (2012)
    Springer-Verlag
    Details
    Publication Date: 2017-04-04
    Description: A test combination procedure of loose constrained SINEX solutions has been set up with the aim to integrate different network solutions (clusters of GPS site coordinates) processed by different analysis groups. Two solution types have been combined on a daily basis, one cluster of about 60 sites processed with the Bernese software and a second cluster of about 30 sites processed with the Gamit software. The chosen networks consists in 15 overlapping EUREF sites on which the combination test is figured out. In origin each solution is obtained in a loose constrained reference frame and archived in SINEX format, the full time series span a period of 2.5 years. If the reference frame constraints, if present, are conveniently relaxed in the original solutions, the combination of daily solutions can be carried out without the removal of relative rotations between reference frames and the different contributing SINEX solutions may be merged (in a least squares sense) into a combined consensus solution. The corresponding velocity fields, computed for the common sites, are consistent with respect to each other and the combined time series show a repeatability of a few millimeters in the vertical and 1–2 millimeters in the horizontal components respectively.
    Description: Published
    Description: 341-346
    Description: Rome
    Description: 1.9. Rete GPS nazionale
    Description: restricted
    Keywords: combination of geodetic solutions ; loosely constrained solutions ; GPS coordinates ; 04. Solid Earth::04.03. Geodesy::04.03.99. General or miscellaneous
    Repository Name: Istituto Nazionale di Geofisica e Vulcanologia (INGV)
    Type: book chapter
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  • 6
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    The RING GPS network: a research geodetic infrastructure to study plate boundary deformation in the Central Mediterranean (2011)
    Geophysical Research Abstracts
    Details
    Publication Date: 2020-02-24
    Description: We present the INGV (Italian National Institute of Geophysics and Volcanology) geodetic research infrastructure and related facilities, dedicated to the observation and monitoring of current deformation of the plate boundary between Africa and Eurasia. The recent increase of continuous GPS (CGPS) stations in the Central Mediterranean plate boundary zone offers the opportunity to study in detail the present-day kinematics of this actively deforming region. For answering all the open questions related to this complex area, INGV deployed a permanent, integrated and real-time monitoring CGPS network (RING) all over Italy. The RING network (http:/ring.gm.ingv.it) is now constituted by more than 150 stations. All stations have high quality GPS monuments and most of them are co-located with broadband or very broadband seismometers and strong motion sensors. The RING CGPS sites acquire at 1Hz and 30s sampling rates (some of them acquire at 10 Hz) and are connected in real-time to the INGV acquisition centers located in Roma and Grottaminarda. Real-time GPS data are transmitted using different systems, such as satellite systems, Internet, GPRS/UMTS and wireless networks. The differentiation of data transmission type and the integration with seismic instruments makes this network one of the most innovative CGPS networks in Europe. Furthermore, the INGV data acquisition centers acquire, archive and analyze most of the Italian CGPS stations managed by regional or national data providers (such as local Authorities and nation-wide industries), integrating more than 350 stations of the CGPS scientific and commercial networks existing in the Italian region. To manage data acquisition, storage, distribution and access we developed dedicated facilities including new softwares for data acquisition and a web-based collaborative environment for management of data and metadata. The GPS analysis is carried out with the three main geodetic-quality softwares used in the GPS scientific community: Bernese GAMIT an GIPSY-OASIS. The resulting daily solutions are aligned to the ITRF2005 reference frame. Stable plate reference frames are realized by minimizing the horizontal velocities at sites on the Eurasia and Nubia plates, respectively. The different software-related solutions consistency RMS is within 0.3 mm/yr (Avallone et al., 2010). The solutions are then evaluated with regard to the numerous scientific motivations behind this presentation, ranging from the definition of strain distribution and microplate kinematics within the plate boundary, to the evaluation of tectonic strain accumulation on active faults. The RING network is strongly contributing to the definition of GPS velocity field in the Italian region, and now is able to furnish a newly and up to date view of this actively deforming part of the Nubia-Eurasia plate boundary. INGV is now aiming to make the RING (and integrated CGPS networks) data and related products publicly available for the scientific community. We believe that our network represents an important reality in the framework of the EPOS infrastructure and we strongly support the idea of an European research approach to data sharing among the scientific community. We will present (a) the current CGPS site distribution, (b) the technological description of the data acquisition, storage and distribution at INGV centers, (c) the results of CGPS data analysis, and (d) the planned data access for the scientific community.
    Description: Published
    Description: Vienna, Geophysical Research Abstracts Vol. 13, EGU2011-8626, 2011
    Description: 1.9. Rete GPS nazionale
    Description: 3.2. Tettonica attiva
    Description: open
    Keywords: GPS network ; Italy ; active deformation ; infrastructure ; 04. Solid Earth::04.03. Geodesy::04.03.99. General or miscellaneous ; 04. Solid Earth::04.03. Geodesy::04.03.01. Crustal deformations ; 04. Solid Earth::04.03. Geodesy::04.03.06. Measurements and monitoring ; 04. Solid Earth::04.03. Geodesy::04.03.07. Satellite geodesy ; 04. Solid Earth::04.03. Geodesy::04.03.09. Instruments and techniques
    Repository Name: Istituto Nazionale di Geofisica e Vulcanologia (INGV)
    Type: Poster session
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  • 7
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    The coseismic and postseismic deformation of the L’Aquila, 2009 earthquake from repeated GPS measurements (2012)
    Details
    Publication Date: 2017-04-04
    Description: We analyze more than 100 GPS time series of continuous and discontinuous GPS stations located in the Abruzzi region (Italy) surrounding the epicentres of the L’Aquila 2009 seismic sequence. The purpose of this work is to reconstruct the coseismic displacement field caused by the 6th April (Mw 6.3) main shock from a dense network of survey-mode stations surrounding the epicentral area and to characterize the early postseismic deformation field. In the months following the main shock, an extensive GPS survey was carried out on the existing Central Apennines Geodetic Network (CAGeoNet), with the intention of collecting a robust data set and to study the co- and postseismic deformation field of this Apenninic normal faulting earthquake. The analysis is carried out with two independent procedures and software (Bernese and Gamit) in order to provide reliable and validated geodetic solutions. The analysis of the postseismic transients and the knowledge of long-term inter-seismic velocities at all GPS stations, issued from permanent and CAGeoNet sites, allow us to derive a dense co- and postseismic displacement field for the L’Aquila Mw 6.3 main shock in a wide area around the epicentre. The highest deformation rate occurs during the first 4-5 months after the main shock and persists in the following at slightly slower rate throughout the whole monitoring period. Fast deformation rates imply that most of the observed deformation is due to a process different from a pure viscoelastic relaxation of the stress perturbation. Since the observed rates would imply a too low effective viscosity value (below 1017 Pa s), we rather suggest that most of the observed deformation in the first months after the earthquake is due to different processes, most likely frictional afterslip possibly modulated by the presence of fluids. The new coseismic displacement field is used to invert for the main shock fault geometry, analysing the consistency among the different geodetic solutions and the combined one, with the goal of validating the two data sets.
    Description: Published
    Description: 348-358
    Description: 1.9. Rete GPS nazionale
    Description: 3.3. Geodinamica e struttura dell'interno della Terra
    Description: JCR Journal
    Description: restricted
    Keywords: GPS, postseismic deformation, coseismic displacements, relaxation time, Apennines ; 04. Solid Earth::04.03. Geodesy::04.03.99. General or miscellaneous ; 04. Solid Earth::04.07. Tectonophysics::04.07.99. General or miscellaneous
    Repository Name: Istituto Nazionale di Geofisica e Vulcanologia (INGV)
    Type: article
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  • 8
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    Sea level change and vertical land movements since the last two millennia along the coasts of southwestern Turkey and Israel (2011)
    Elsevier
    Details
    Publication Date: 2020-02-24
    Description: This paper provides new relative sea-level data inferred from coastal archaeological sites located along the Turkish coasts of the Gulf of Fethye (8 sites), and Israel, between Akziv and Caesarea (5 sites). The structures selected are those that, for effective functioning, can be accurately related to sea level at the time of their construction. Thus their positions with respect to present sea level provide a measure of the relative sea level change since their time of construction. Useful information was obtained from the investigated sites spanning an age range of ~2.3 to ~1.6 ka BP. The inferred changes in relative sea level for the two areas are distinctly different, from a rise of 2.41 to 4.50 m in Turkey and from 0 to 0.18 m in Israel. Sea level change is the combination of several processes, including vertical tectonics, glacio–hydro-isostatic signals associated with the last glacial cycle, and changes in ocean volume. For the Israel section, the present elevations of the MIS 5.5 Tyrrhenian terraces occur at a few meters above present sea level and vertical tectonic displacements are small. Data from GPS and tide gauge measurements also indicate that any recent vertical movements are small. The MIS-5.5 shorelines are absent from the investigated section of the Turkish coast, consistent with crustal subsidence associated with the Hellenic Arc. The isostatic signals for the Israel section of the coast are also small (ranging from -0.11 mm/year to 0.14 mm/year, depending on site and earth model) and the observed (eustatic) average sea level change, corrected for this contribution, is a rise of 13.5±2.6 cm during the past ~2 ka. This is attributed to the time-integrated contribution to sea level from a combination of thermal expansion and other increases in ocean volume. The observed sea levels from the Turkish sites, in contrast, indicate a much greater rise of up to 2.2 mm/yr since 2.3 ka BP occurring in a wide area between Knidos and Kekova. The isostatic signal here is also one of a rising sea level (of up to ~ 1mm/year and site and earth-model dependent) and the corrected tectonic rate of land subsidence is ~1.48 mm/year. This is the primary cause of dramatic relative sea level rise for this part of the coast.
    Description: In press
    Description: 3.3. Geodinamica e struttura dell'interno della Terra
    Description: JCR Journal
    Description: open
    Keywords: Turkey, Israel, Sea level, vertical tectonics ; 04. Solid Earth::04.03. Geodesy::04.03.99. General or miscellaneous
    Repository Name: Istituto Nazionale di Geofisica e Vulcanologia (INGV)
    Type: article
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