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  • 04. Solid Earth::04.03. Geodesy::04.03.06. Measurements and monitoring  (9)
  • 1
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    Strain accumulation across the Messina Straits and kinematics of Sicily and Calabria from GPS data and dislocation modeling (2011)
    Elsevier
    Details
    Publication Date: 2020-12-03
    Description: We use Global Positioning System (GPS) velocities and dislocation modeling to investigate the rate and nature of interseismic strain accumulation in the area affected by the 1908 Mw 7.1 Messina earthquake (southern Italy) within the framework of the complex central Mediterranean microplate kinematics. Our data confirm a change in the velocity trends between Sicily and Calabria, moving from NNW-ward to NE- ward with respect to Eurasia, and detail a fan-like pattern across the Messina Straits where maximum extensional strain rates are ~65 nanostrains/yr. Extension normal to the coast of northern Sicily is consistent with the presence of SW–NE trending normal faults. Half-space dislocation models of the GPS velocities are used to infer the slip-rates and geometric fault parameters of the fault zone that ruptured in the Messina − 1.3 earthquake. The inversion, and the bootstrap analysis of model uncertainties, finds optimal values of 3. 5 + 2.0 − 0.2− 0.7 and 1.6 + 0.3 mm/yr for the dip–slip and strike–slip components, respectively, along a 30 + 1.1° SE-ward dipping normal fault, locked above 7.6−2.9 km depth. By developing a regional elastic block model that + 4.6 accounts for both crustal block rotations and strain loading at block-bounding faults, and adopting two different competing models for the Ionian–Calabria convergence rates, we show that the measured velocity gradient across the Messina Straits may be significantly affected by the elastic strain contribution from other nearby faults. In particular, when considering the contribution of the possibly locked Calabrian subduction interface onto the observed velocity gradients in NE-Sicily and western Calabria, we find that this longer wavelength signal can be presently super-imposed on the observed velocity gradients in NE-Sicily and Calabria. The inferred slip-rate on the Messina Fault is significantly impacted by elastic strain from the subduction thrust. By varying the locking of the subduction thrust fault, in fact, the Messina Fault slip-rate varies from 0 to 9 mm/yr.
    Description: Published
    Description: 347-360
    Description: 1.9. Rete GPS nazionale
    Description: 3.2. Tettonica attiva
    Description: JCR Journal
    Description: open
    Keywords: Messina Straits ; Global Positioning System ; strain accumulation ; plate kinematics ; dislocation modeling ; 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::04.06. Seismology::04.06.01. Earthquake faults: properties and evolution ; 04. Solid Earth::04.06. Seismology::04.06.11. Seismic risk ; 04. Solid Earth::04.07. Tectonophysics::04.07.04. Plate boundaries, motion, and tectonics ; 04. Solid Earth::04.07. Tectonophysics::04.07.06. Subduction related processes ; 04. Solid Earth::04.07. Tectonophysics::04.07.07. Tectonics
    Repository Name: Istituto Nazionale di Geofisica e Vulcanologia (INGV)
    Type: article
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  • 2
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    Insight on recent Stromboli eruption inferred from terrestrial and satellite ground deformation measurements (2009)
    Elsevier
    Details
    Publication Date: 2017-04-04
    Description: The multi-parametric permanent system (tilt and GPS networks, robotized geodetic station) for monitoring ground deformation at Stromboli volcano was set up in the 1990s and later greatly improved during the effusive event of 2002–2003. Unlike other volcanoes, e.g. Mt. Etna, the magnitude of ground deformation signals of Stromboli is very small and through the entire period of operation of the monitoring system, only two major episodes of deformation, in 1994–1995 and 2000, which did not lead to an eruption but rather pure intrusion, were measured. Similarly to the 2002–2003 eruption, no important deformations were detected in the months before the 2007 eruption. However, unlike the 2002–2003 eruption, GPS and tilt stations recorded a continuous deflation during the entire 2007 eruption, which allowed us to infer a vertical elongated prolate ellipsoidal source, centered below the summit craters at depth of about 2.8 km b.s.l. Due to its geometry and position, this source simulates an elongated plumbing system connecting the deeper LP magma storage (depth from 5 to 10 km) with the HP shallower storage (0.8–3 km), both previously identified by petrologic and geochemical studies. This result represents the first contribution of geophysics to the definition of the plumbing system of Stromboli at intermediate depth. Finally, no deformation due to the plumbing system was measured for a long time after the end of the eruption. Meanwhile, the new terrestrial geodetic monitoring system installed within the Sciara del Fuoco, on the lava fan formed during the eruption, indicated that during the first months after the end of the eruption the ground velocity progressively decreased in time, suggesting that part of the deformation was due to the thermal contraction of the lava flow.
    Description: Published
    Description: 172-181
    Description: 1.3. TTC - Sorveglianza geodetica delle aree vulcaniche attive
    Description: JCR Journal
    Description: reserved
    Keywords: Stromboli ; Ground Deformation ; source modelling ; flank instability ; 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 ; 04. Solid Earth::04.08. Volcanology::04.08.06. Volcano monitoring ; 04. Solid Earth::04.08. Volcanology::04.08.07. Instruments and techniques ; 04. Solid Earth::04.08. Volcanology::04.08.08. Volcanic risk ; 05. General::05.02. Data dissemination::05.02.03. Volcanic eruptions
    Repository Name: Istituto Nazionale di Geofisica e Vulcanologia (INGV)
    Type: article
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  • 3
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    Metodo basato sulla tecnologia laser scanning per la misura delle deformazioni indotte negli edifici dai sismi o altri eventi distruttivi (2013)
    Museo Civico di Rovereto
    Details
    Publication Date: 2013-02-27
    Description: Il monitoraggio di edifici danneggiati in un'area colpita da un terremoto richiede l'uso di tecniche di osservazione e misura in grado di fornire dati molto rapidamente, in particolare in condizioni di emergenza. Tecniche di telerilevamento quali il laser scanner terrestre (TLS) sono in grado di soddisfare tali requisiti perché consentono di ottenere nuvole di punti molto dense in tempo relativamente breve, a loro volta utilizzabili per generare modelli geometrici dettagliati e precisi degli edifici osservati. L'esecuzione di una sessione di misura in condizioni di emergenza è generalmente caratterizzata da forti vincoli sulle possibili posizioni dello strumento utilizzato; ciò comporta che la distanza di acquisizione e l'angolo di incidenza del fascio laser potrebbero essere molto lontani dalle condizioni ottimali per alcune parti, anche molto estese, dell'edificio studiato. Per tali motivi, una corretta interpretazione di dati richiede una serie di esperimenti e di simulazioni numeriche finalizzate ad una realistica quantificazione del rumore di osservazione, registrazione e modellazione, con enfasi sul riconoscimento e sulla riduzione dei corrispondenti artefatti, ossia errori sistematici legati all'uso del TLS in condizioni non ottimali. E' pertanto qui proposta una strategia operativa basata sulla generazione iterativa di mappe morfologiche quali differente tra nuvola di punti e una o più corrispondenti primitive. Si tratta di un metodo di facile uso per il monitoraggio di precisione in condizioni di emergenza. Al fine di metterne in evidenza la validità, sono mostrati i risultati principali (mappe di deformazione) ottenuti dall'applicazione del metodo ad alcuni edifici compiti dal recente terremoto dell'Emilia Romagna.
    Description: CODEVINTEC s.r.l. Milano e IND.A.G.O. snc Rovigo
    Description: Published
    Description: Museo Civico di Rovereto
    Description: 1.1. TTC - Monitoraggio sismico del territorio nazionale
    Description: restricted
    Keywords: Laser Scanning ; Misura delle Deformazioni ; Edifici in area sismica ; Metodologia ; 04. Solid Earth::04.03. Geodesy::04.03.06. Measurements and monitoring
    Repository Name: Istituto Nazionale di Geofisica e Vulcanologia (INGV)
    Type: Oral presentation
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  • 4
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    Stromboli 2007 eruption: Deflation modeling to infer shallow-intermediate plumbing system. (2008)
    AGU
    Details
    Publication Date: 2017-04-04
    Description: During the effusive phase of the Stromboli 2007 eruption, the GPS and tilt stations recorded small but significant changes which, for the first time at this volcano, clearly indicated a deflation. We modeled the deflation, inferring a depressurizing vertically elongated source with centre under the volcano edifice about 2.8 km below sea level. The model, whose position is above the magma source region inferred by petrological studies, and the associated rapid deflation suggest a near free pathway for magma ascent from this source to the upper shallow conduit.
    Description: Published
    Description: L06311
    Description: 1.3. TTC - Sorveglianza geodetica delle aree vulcaniche attive
    Description: JCR Journal
    Description: reserved
    Keywords: Stromboli ; 2007 eruption ; ground deformation ; modelling ; 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::04.08. Volcanology::04.08.06. Volcano monitoring
    Repository Name: Istituto Nazionale di Geofisica e Vulcanologia (INGV)
    Type: article
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  • 5
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    Soluzioni indipendenti di reti GPS effettuate con vari programmi scientifici: l’importanza della divulgazione delle informazioni (2011)
    INGV
    Details
    Publication Date: 2017-04-04
    Description: Nel presente lavoro vengono descritte le potenzialità del compensatore GLOBK di proprietà del MIT nella combinazione e stabilizzazione di soluzioni derivanti da differenti standard di analisi dato di varie reti GPS. Le grandi prestazioni garantite da questo metodo di compensazione permettono di ottenere risultati di alta qualità e precisione pur disponendo di una potenza di calcolo limitata, caratteristica dei PC di nuova generazione e medio-basso profilo. Nel lavoro sono descritti i risultati delle compensazioni in termini di campi di velocità globali/regionali e serie temporali. Inoltre tutte le caratteristiche delle soluzioni finali quali: polo di rotazione, definizione dei sistemi di riferimento, ecc sono facilmente ottenibili.
    Description: Published
    Description: 1-19
    Description: 1.9. Rete GPS nazionale
    Description: N/A or not JCR
    Description: restricted
    Keywords: GPS ; Reti Permanenti ; Quasi Osservazioni ; Combinazione ; Compensazione ; Sistemi di Riferimento ; 04. Solid Earth::04.03. Geodesy::04.03.06. Measurements and monitoring
    Repository Name: Istituto Nazionale di Geofisica e Vulcanologia (INGV)
    Type: article
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  • 6
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    Rilievo laser scanning a lunga distanza su frana mediante ILRIS LR (2012)
    Details
    Publication Date: 2017-04-03
    Description: Fin dal 2005 l'Istituto Nazionale di Geofisica e Vulcanologia (INGV) ha operato in ambiente vulcanico grazie alle interessanti prestazioni degli scanner ILRIS 3D e ILRIS ER (Optech). Le precisione e l'alta densità delle misure ottenute, insieme alla potenza dei sistemi di allineamento dele immagini hanno reso possibile, tra le tante esperienze, il monitoraggio delle variazioni superficiali nel cratere del Vesuvio. l'identificazione delle pareti maggiormente interessate da fenomeni franosi e la valutazione, con buona precisione, dei volumi di roccia crollati [Pesci el al., 2011a].
    Description: Geomedia
    Description: Published
    Description: 1.10. TTC - Telerilevamento
    Description: restricted
    Keywords: Monitoraggio frane ; Laser Scanning ; Long Range ; Allineamento Immagini ; 04. Solid Earth::04.03. Geodesy::04.03.06. Measurements and monitoring
    Repository Name: Istituto Nazionale di Geofisica e Vulcanologia (INGV)
    Type: report
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  • 7
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    Deformation of Ancient Buildings inferred by Terrestrial Laser Scanning methodology: the Cantalovo church case study (Northern Italy) (2013)
    Wiley-Blackwell
    Details
    Publication Date: 2017-04-04
    Description: The study of the health of a building connects humanistic and scientific research, and a complete characterization can be achieved by integrating all the available historical documentation, architectural and metrological studies, as well as laboratory and in situ analyses of the materials. A contactless, non-invasive surveying technique such as terrestrial laser scanning (TLS) allows the acquisition of dense and accurate geometric and radiometric (electromagnetic measurements such as signal intensity) information about the observed surface of the building, which can be easily integrated with data provided by high-resolution digital imaging. The early Christian Cantalovo church was surveyed for the first time in April 2011, by means of the ILRIS-3D ER very long range scanner. The second and last survey was performed in June 2012, after the main shocks of the Emilia earthquake seismic sequence. A very long range instrument is suitable for fast, simple and independent measurements, due to its technical characteristics and, for this reason, is easily usable for accurate surveying in emergency conditions. The main results are obtained by applying a data analysis strategy based on the creation of TLS-based morphological maps computed as point-to-primitive differences, which allow the creation of a deformation map and its evolution in time.
    Description: Published
    Description: 703-716
    Description: 1IT. Reti di monitoraggio e Osservazioni
    Description: JCR Journal
    Description: restricted
    Keywords: Terrestrial Laser Scanning ; Deformation ; Earthquake ; Ancient Building ; Procedure Standardization ; 04. Solid Earth::04.03. Geodesy::04.03.06. Measurements and monitoring
    Repository Name: Istituto Nazionale di Geofisica e Vulcanologia (INGV)
    Type: article
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  • 8
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    Surface movements in Bologna (Po Plain — Italy) detected by multitemporal DInSAR (2007)
    Elsevier
    Details
    Publication Date: 2019-10-18
    Description: We studied the surface deformations affecting the southeastern sector of the Po Plain sedimentary basin, in particular the area of Bologna. To this aim an advanced DInSAR technique, referred to as DInSAR–SBAS (Small BAseline Subset), has been applied. This technique allows monitoring the temporal evolution of a deformation phenomenon, via the generation of mean deformation velocity maps and displacement time series from a data set of acquired SAR images. In particular, we have processed a set of SAR data acquired by the European Remote Sensing Satellite (ERS) sensors and compared the achieved results with optical levelling measurements, assumed as reference. The surface displacements detected by DInSAR SBAS from 1992 to 2000 are between 10 mm/year in the historical part of Bologna town, and up to 59 mm/year in the NE industrial and agricultural areas. Former measurements from optical levelling referred to 1897 show 2–3 mm/year vertical movements. This trend of displacement increased in the second half of the 20th century and the subsidence rate reached 60 mm/year. We compared the more recent levelling campaigns (in 1992 and late 1999) and DInSAR results from 1992 to 1999. The standard deviation of the difference between levelling data, projected onto the satellite Line Of Sight, and DInSAR results is 2 mm/year. This highlights a good agreement between the measurements provided by two different techniques. The explanation of soil movements based on interferometric results, ground data and geological observations, allowed confirming the anthropogenic cause (surface effect due to the overexploitation of the aquifers) and highlights a natural, tectonic, subsidence.
    Description: Published
    Description: 304-316
    Description: 1.10. TTC - Telerilevamento
    Description: JCR Journal
    Description: partially_open
    Keywords: InSAR ; surface deformation ; SAR interferometry ; 04. Solid Earth::04.03. Geodesy::04.03.99. General or miscellaneous ; 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::04.03.01. Crustal deformations ; 04. Solid Earth::04.07. Tectonophysics::04.07.07. Tectonics ; 04. Solid Earth::04.08. Volcanology::04.08.07. Instruments and techniques
    Repository Name: Istituto Nazionale di Geofisica e Vulcanologia (INGV)
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  • 9
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    Coseismic displacement of the 27th September 1997 Umbria - Marche (Italy) earthquakes detected by GPS: campaigns and data (2006)
    Details
    Publication Date: 2019-11-04
    Description: On September 26,1997 two earthquakes of Mw 5.7 (00.33 GMT) and Mw 6.0 (9.40 GMT), occurred in the Umbria-Marche region (Central Apennines, Italy). The epicentres were located in an area of the Apenninic chain that experienced historical earthquakes up to X degrees of the MCS scale. During the time span 1992-1996, the Italian Istituto Geografico Militare (IGM) set up a new national geodetic network measured by Global Positioning System space geodetic technique, consisting of more than 1200 vertices uniformly distributed on the Italian peninsula and islands. From October 7 to 11, 1997, a short while after the main shocks of the Umbria-Marche seismic sequence, we reoccupied thirteen stations belonging to the IGM and TYRGEONET networks to measure coseismic displacement. The determinations of the post-seismic coordinates at 13 GPS monuments detected significant coseismic displacements. The comparison between the preseismic and postseismic data sets show maximum displacements of 14 cm and 25 cm in the horizontal and vertical components respectively. In this paper, the GPS network, the field work, the data processing procedures and the computed coseismic displacements measured at the geodetic monuments are discussed with the aim to provide a data set useful to the scientific
    Description: JCR Journal
    Description: open
    Keywords: Umbria-Marche earthquakes ; IGM95 ; GPS ; coseismic displacement ; 04. Solid Earth::04.03. Geodesy::04.03.06. Measurements and monitoring
    Repository Name: Istituto Nazionale di Geofisica e Vulcanologia (INGV)
    Type: article
    Format: 3429269 bytes
    Format: application/pdf
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