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  • 04. Solid Earth::04.03. Geodesy::04.03.06. Measurements and monitoring  (3)
  • 04. Solid Earth::04.03. Geodesy::04.03.01. Crustal deformations  (2)
  • 04. Solid Earth::04.06. Seismology::04.06.06. Surveys, measurements, and monitoring  (1)
  • 1
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    Improving strain rate estimation from velocity data of non-permanent GPS stations: the Central Apennine study case (Italy) (2009)
    Springer
    Details
    Publication Date: 2020-11-17
    Description: An efficient procedure is proposed in order to define realistic lower limits of velocity errors of a non-permanent GPS station (NPS), i.e. a station where the antenna is installed and operates for short time periods, typically 10-20 days per year. Moreover, the proposed method is aimed at being independent from the standard GPS data processing. The key is to appropriately subsample the coordinate time series of several continuous GPS stations (CGPSs) situated nearby or inside the considered NPS network, in order to simulate the NPS behavior and to estimate the velocity errors associated with the subsampling procedure. The obtained data are therefore used as lower limits to accept or correct the error estimates provided by standard data processing. The proposed approach is applied to data from the dense non-permanent network in the Central Apennine of Italy based on a sequence of solutions for the overlapping time spans 1999-2003, 1999-2004, 1999-2005 and 1999-2007. Both the original and error-corrected velocity patterns are used to compute the strain rate fields. The comparison between the corresponding results reveals large differences that could lead to divergent interpretations about the kinematics of the study area.
    Description: Published
    Description: 249–261
    Description: 2T. Deformazione crostale attiva
    Description: JCR Journal
    Description: reserved
    Keywords: Non-permanent GPS Stations ; Velocity Field ; Strain Rate ; Survey Optimization; ; Solution Sequence ; 04. Solid Earth::04.03. Geodesy::04.03.01. Crustal deformations
    Repository Name: Istituto Nazionale di Geofisica e Vulcanologia (INGV)
    Type: article
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  • 2
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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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  • 3
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    Strain rate analysis over the Central Apennines from GPS velocities: the development of a new free software (2006)
    Details
    Publication Date: 2017-04-03
    Description: Displacements or velocities obtained by GPS data processing over repeated surveys can provide useful information on tensional states of terrestrial crust, in those areas in which many stations well spatially distributed are present. In particular, the strain (or strain rate) can be computed over the nodes of a regular grid with suitable size to define a high density deformation field. A new method was deployed to generate easily and quickly the deformation pattern from GPS velocities and to evaluate the significance: values, related to an assigned grid point, can be truly considered only if the GPS stations are well distributed around it. The approach validation was performed by means of synthetic data derived from the theoretical displacement field generated by a Mogi model source. A complete analysis on the velocity pattern of the CaGeoNet network (Central Apennine chain, Italy) was performed providing strain rates and showing both extensional and compressive behaviour at the same values, along the Apennine chain axis.
    Description: Submitted
    Description: open
    Keywords: GPS velocity ; strain rate ; gridstrain software ; grid ; 04. Solid Earth::04.03. Geodesy::04.03.01. Crustal deformations
    Repository Name: Istituto Nazionale di Geofisica e Vulcanologia (INGV)
    Type: manuscript
    Format: 362885 bytes
    Format: 785703 bytes
    Format: application/pdf
    Format: application/pdf
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  • 4
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    grid_strain and grid_strain3: software packages for strain (2007)
    Details
    Publication Date: 2017-04-04
    Description: Two MatlabTM software packages for strain field computation, starting from displacements of experimental points (EPs), are here presented. In particular, grid_strain estimates the strain on the nodes of a regular planar grid, whereas grid_strain3 operates on the points of a digital terrain model (DTM). In both cases, the computations are performed in a modified least square approach, emphasizing the effects of nearest points. This approach allows users to operate at different scales of analysis by introducing a scale factor to reduce or also exclude too far points from grid nodes. The input data are displacements (or velocities) that can be provided by several techniques (e.g. GPS, total topographical station, terrestrial laser scanner). The analysis can be applied to both regional- and local-scale phenomena, to study tectonic crustal deformations (strain 6 8 10 10 − ≈ − ) or rapid landslide collapses ( 2 4 10 10 − − ), and to characterize the kinematics of the studied system. Errors on strains and geometric significance of the results are also provided.
    Description: In press
    Description: 1.10. TTC - Telerilevamento
    Description: JCR Journal
    Description: reserved
    Keywords: Strain Field; Crustal Deformations; Landslide deformations; Landslide ; 04. Solid Earth::04.03. Geodesy::04.03.06. Measurements and monitoring
    Repository Name: Istituto Nazionale di Geofisica e Vulcanologia (INGV)
    Type: manuscript
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  • 5
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    A laser scanning-based method for fast estimation of seismic-induced building deformations (2013)
    Elsevier Science Limited
    Details
    Publication Date: 2017-04-04
    Description: Monitoring damaged buildings in an area where an earthquake has occurred requires the use of techniques which provide rapid and safe measurements even in emergency conditions. In particular, remote sensing techniques like terrestrial laser scanning (TLS) can satisfy these requirements, since they produce very dense point clouds in little time and also allow an accurate geometric modeling of observed buildings. Nevertheless, strong constraints on TLS data acquisition geometry, such as acquisition distance and incidence angles, typically characterize an area in seismic emergency conditions. In order to correctly interpret the data, it is necessary to estimate errors affecting TLS measurements in these critical conditions. A reliable estimation can be achieved by means of experiments and numerical simulations aimed at quantifying a realistic noise level, with emphasis on reduction of artifacts due to data acquisition, registration and modeling. This paper proposes a data analysis strategy in which TLS-based morphological maps computed as point-to-primitive differences are created. The method can be easily used for accurate surveying in emergency conditions. In order to demonstrate the proposed method in very diverse situations, it was applied to rapidly detect deformation traces in the San Giacomo Roncole Campanile (Modena), the Asinelli tower (Bologna) and the Cantalovo Church (Verona), three buildings damaged by the Mw 5.9 Emilia Romagna 2012 earthquake (Italy). 2013 International Society for Photogrammetry and Remote Sensing, Inc. (ISPRS) Published by Elsevier
    Description: Published
    Description: 185-198
    Description: 1.10. TTC - Telerilevamento
    Description: JCR Journal
    Description: restricted
    Keywords: Architecture ; Change Detection ; Laser Scanning ; Model ; Performance ; 04. Solid Earth::04.06. Seismology::04.06.06. Surveys, measurements, and monitoring
    Repository Name: Istituto Nazionale di Geofisica e Vulcanologia (INGV)
    Type: article
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  • 6
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    Remote Sensing and Geodetic Measurements for Volcanic Slope Monitoring: Surface Variations Measured at Northern Flank of La Fossa Cone (Vulcano Island, Italy) (2013)
    Details
    Publication Date: 2017-04-04
    Description: Abstract: Results of recent monitoring activities on potentially unstable areas of the NW volcano flank of La Fossa cone (Vulcano Island, Italy) are shown here. They are obtained by integration of data by aerial photogrammetry, terrestrial laser scanning (TLS) and GPS taken in the 1996–2011 time span. A comparison between multi-temporal models built from remote sensing data (photogrammetry and TLS) highlights areas characterized by ~7–10 cm/y positive differences (i.e., elevation increase) in the upper crown of the slope. The GPS measurements confirm these results. Areas characterized by negative differences, related to both mass collapses or small surface lowering, also exist. The higher differences, positive and negative, are always observed in zones affected by higher fumarolic activity. In the 2010–2012 time span, ground motions in the northern part of the crater rim, immediately above the upper part of observed area, are also observed. The results show different trends for both vertical and horizontal displacements of points distributed along the rim, with a magnitude of some centimeters, thus revealing a complex kinematics. A slope stability analysis shows that the safety factors estimated from these data do not OPEN ACCESS Remote Sens. 2013, 5 2239 indicate evidence of possible imminent failures. Nevertheless, new time series are needed to detect possible changes with the time of the stability conditions, and the monitoring has to go on.
    Description: Published
    Description: 2238-2256
    Description: 1.3. TTC - Sorveglianza geodetica delle aree vulcaniche attive
    Description: N/A or not JCR
    Description: open
    Keywords: Terrestrial Laser Scanning ; aerial photogrammetry ; GPS ; 3D modeling ; Volcano ; Landslide ; 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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