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  • 04. Solid Earth::04.03. Geodesy::04.03.01. Crustal deformations
  • GPS
  • INGV  (13)
  • Blackwell Publishing  (1)
  • Blackwell Publishing Ltd  (1)
  • American Society of Hematology
  • Nature Publishing Group
  • 2005-2009  (15)
  • 1980-1984
  • 1965-1969
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Publisher
Years
Year
  • 1
    Publication Date: 2021-05-17
    Description: A comparison between two of the most used scintillation models and experimental data is presented. The experimental data have been derived from a GPS scintillation monitor developed at Cornell University and placed in Tucuman (Argentina), under the peak of the anomaly. The models used (GISM and WBMOD) have been run for the geophysical conditions corresponding to the measurements. The comparison is done by subdividing the information on the basis of an ionospheric grid of 5°×5° surface square boxes. The comparison has been performed for several local times, from 18 LT until 04 LT. Here, only a few cases of particular interest are shown. The goal is to understand if the models are able to forecast actual scintillation morphology (from the satellite navigation systems point of view) and if they could be used to yield an estimate of scintillation effects on satellite navigation systems.
    Description: Published
    Description: JCR Journal
    Description: open
    Keywords: ionospheric scintillations ; scintillation models ; GPS ; SBAS ; 01. Atmosphere::01.02. Ionosphere::01.02.99. General or miscellaneous ; 04. Solid Earth::04.03. Geodesy::04.03.99. General or miscellaneous
    Repository Name: Istituto Nazionale di Geofisica e Vulcanologia (INGV)
    Type: article
    Format: 637511 bytes
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  • 2
    Publication Date: 2020-10-27
    Description: In this paper we show results from the combinantion of GPS and CGPS data to estimate the velocity and strain fields across the Messina Straits. Data from CGPS networks of ASI, RING and ITALPOS together with GPS data collected since 1980 during repeated campaigns and recently in the frame of the "Progetto Messina" funded by DPC, are discussed and interpreted to improve the current kinematics of this seismic area.
    Description: Published
    Description: Reggio Calabria
    Description: 3.2. Tettonica attiva
    Description: open
    Keywords: GPS, Stretto di Messina ; 04. Solid Earth::04.03. Geodesy::04.03.01. Crustal deformations
    Repository Name: Istituto Nazionale di Geofisica e Vulcanologia (INGV)
    Type: Conference paper
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  • 3
    Publication Date: 2017-04-04
    Description: The tectonic deformation of the Lipari-Vulcano complex, one of the most important active volcanic areas of Mediterranean region, is studied here through the analysis of ten years (1996-2006) of GPS data from both 3 permanent and 13 non-permanent stations. This area can be considered crucial for the understanding of the Eurasia-Africa plates interaction in the Mediterranean area, and, in general, this work emphasize a methodological approach, already applied in other areas worldwide (e.g. Shen et al., 1996, El-Fiki and Kato, 1999) where geodetic data and strain parameters maps of critical areas can help to improve our understanding of their geodynamical aspects. In this framework, this study is aimed at providing a kinematic deformation model on the basis of the dense geodetically estimated velocities of the Lipari-Vulcano complex. In particular, the observed deformation pattern can be described by a mix between 1) the main N-S regional compression and 2) a NNE-SSW compression with a small right-lateral strike slip component acting along a tectonic structure N°40W trending located between the two islands. This pattern was inspected through a simplified synthetic model.
    Description: This research has benefited from funding provided by the Italian Presidenza del Consiglio dei Ministri – Dipartimento della Protezione Civile (DPC).
    Description: Published
    Description: 370–377
    Description: 1.9. TTC - Rete GPS nazionale
    Description: JCR Journal
    Description: reserved
    Keywords: GPS ; Aeolian Islands ; strain ; modelling ; 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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  • 4
    Publication Date: 2017-04-04
    Description: We analysed elevation changes induced by the 1997–1998 Umbria-Marche, central Apennines (Italy) earthquakes. We employed data from a first-order geodetic levelling line measured in 1951, 1992 and 1998. The line bears a record of pre-seismic and coseismic strains associated with the causative fault of the 1997 September 26, 09:40 mainshock (Mw = 6.0). A first level analysis performed under the assumption of slip homogeneity of coseismic slip shows misfits that cannot be reduced simply by altering the fault size and geometry. A more detailed analysis based on a distribution of coseismic slip obtained from broad-band seismograms provides a better fit and is in agreement with 1951–1992 elevation changes interpreted as precursory slip by previous investigators. The levelling data sets new constraints on the location, extent, dip and depth of the fault, in full agreement with seismological evidence and images from SAR interferometry. The data show no evidence for slip in the uppermost 3 km of the crust, suggesting that a major and widely recognized normal fault that exists in the area is no longer active and showing a tendency of present tectonic strains to revert the current topographic setting.
    Description: Published
    Description: 819-829
    Description: 3.2. Tettonica attiva
    Description: JCR Journal
    Description: reserved
    Keywords: earthquakes ; fault slip ; geodesy ; normal faulting ; Umbria-Marche ; 04. Solid Earth::04.03. Geodesy::04.03.01. Crustal deformations ; 04. Solid Earth::04.06. Seismology::04.06.03. Earthquake source and dynamics
    Repository Name: Istituto Nazionale di Geofisica e Vulcanologia (INGV)
    Type: article
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  • 5
    Publication Date: 2017-04-04
    Description: In questa nota sono riportati i risultati ottenuti da indagini geodetiche effettuate nell’area del Sannio-Matese nell’ambito di una Convenzione triennale perfezionata tra l’Assessorato ai Lavori Pubblici della Regione Molise e l’INGV-OV, rivolta all’individuazione di eventuali fenomeni deformativi del suolo in atto nel comune di Bojano (CB). Lo studio, condotto nel periodo 2004-2006, ha visto la progettazione di una rete geodetica nell’area del Comune di Bojano, avente come riferimento il Cs 104 della Linea 80 IGMI corrispondente al Cs LBO/AIGM in Carta, e la materializzazione di vertici GPS, caposaldi di livellazione e l’installazione di Dry Tilt. Le misure di livellazione sull’intera rete, relative al caposaldo di riferimento, hanno evidenziato un generale trend in subsidenza nel bacino di Bojano connesso, con buona probabilità, alle oscillazioni stagionali della falda. I risultati dellemisure sui vertici della rete GPS sono in buon accordo con quelli ottenuti dalle misure di livellazione, evidenziando un trend in subsidenza nella piana di Bojano e nell’area delle sorgenti del Biferno. Le stime dell’inclinazione del suolo ottenute attraverso l’applicazione della tecnica dei dry-tilt hanno delineato un quadro deformativo relativo alla zona cittadina di Bojano consistente in una inclinazione del suolo nel quadrante ENE.
    Description: Published
    Description: 1-80
    Description: 3.1. Fisica dei terremoti
    Description: N/A or not JCR
    Description: open
    Keywords: BOJANO ; RETE GEODETICA ; LIVELLAZIONE ; GPS ; DRY TILT ; 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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  • 6
    Publication Date: 2012-02-03
    Description: Since 2002, between Catanzaro and Vibo Valentia (Calabria), has been set up a new high resolution GPS network. The aim of this network is to record the interseismic and co-seismic deformations of this active region which experienced destructive earthquakes but it is not yet occupied by a GPS geodetic network.
    Description: Published
    Description: Reggio Calabria
    Description: 3.2. Tettonica attiva
    Description: open
    Keywords: GPS, Calabria, Stretto di Messina ; 04. Solid Earth::04.03. Geodesy::04.03.01. Crustal deformations
    Repository Name: Istituto Nazionale di Geofisica e Vulcanologia (INGV)
    Type: Conference paper
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  • 7
    Publication Date: 2017-04-04
    Description: Il terremoto del 1908 che ha distrutto le città di Reggio Calabria e Messina costituisce il primo esempio in cui, attraverso l’utilizzo di dati geodetici, è stato possibile ricostruire il campo di deformazione verticale collegato al catastrofico evento. In questo lavoro vengono riassunti i principali risultati della ricerca incentrata sulla caratterizzazione cinematica dell’area dello Stretto di Messina e vengono presentati i primi risultati della rete misurata con modalità GPS nel corso del 2001 e del 2003 nella stessa area. Questi risultati confermano l’importanza dell’approfondimento delle attività di monitoraggio geodetico tra il complesso peloritano calabro e quello siciliano, anche allo scopo di chiarire le numerose ambiguità riscontrate, in questi anni, nella definizione delle strutture che hanno originato il terremoto del 1908.
    Description: Published
    Description: 1-18
    Description: open
    Keywords: GPS ; 04. Solid Earth::04.03. Geodesy::04.03.01. Crustal deformations ; 04. Solid Earth::04.03. Geodesy::04.03.07. Satellite geodesy ; 04. Solid Earth::04.07. Tectonophysics::04.07.02. Geodynamics
    Repository Name: Istituto Nazionale di Geofisica e Vulcanologia (INGV)
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  • 8
    Publication Date: 2019-11-04
    Description: Water vapour is a variable component of the atmosphere both in space and time. It is one of the most important components because of its effects in many fi elds: Meteorology, Climatology, Remote Sensing, Energy-Budget, Hydrology, etc. This work compares radiometric (sun photometer) readings, Global Positioning System (GPS) data and a meteorological model forecasted data. The aim is to understand if GPS measurements may help Numerical Weather Prediction (NWP) models. It is well known that GPS measurements are affected by the so-called tropospheric delay. Part of it, the so-called wet delay is related mainly to the amount of water vapour along the path of the GPS signal through the troposphere. Precise knowledge of the abundance of water vapour, in space and time, is important for NWP model because water vapour is the predecessor of precipitation. Despite the high variability of water vapour compared to other meteorological fi elds, like pressure and wind, water vapour observations are scarce, so that additional measurements of water vapour are expected to benefi t meteorology. A new sun photometer, which is part of the AERONET (AErosol and RObotic NETwork) program, has been installed at the ENEA (Ente per le Nuove tecnologie, l'Energia e l'Ambiente) base of Lampedusa Island. The sun photometer is quite close (less then 4 km) to an ASI (Agenzia Spaziale Italiana) GPS permanent receiver. A long record (summer period of the year 2000) of sun photometric measurements is available for the station at Lampedusa. We found that the GPS and sun photometric data are better correlated (std. dev. about 10 mm for the wet delay) than are the GPS measurements with the NWP model predictions. This is an indication that GPS delay data may contain information useful for weather prediction.
    Description: Published
    Description: JCR Journal
    Description: open
    Keywords: water-vapour ; aerosols ; GPS ; sunphotometer ; NWP-model ; 01. Atmosphere::01.01. Atmosphere::01.01.08. Instruments and techniques
    Repository Name: Istituto Nazionale di Geofisica e Vulcanologia (INGV)
    Type: article
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  • 9
    Publication Date: 2019-11-04
    Description: Using the international ground-based network of two-frequency receivers of the GPS navigation system provides a means of carrying out a global, continuous and fully-computerized monitoring of phase fluctuations of signals from satellite-borne radio engineering systems caused by the Earth's inhomogeneous and nonstationary ionosphere. We found that during major geomagnetic storms, the errors of determination of the range, frequency Doppler shift and angles of arrival of transionospheric radio signals exceeds that for magnetically quiet days by one order of magnitude as a minimum. This can be the cause of performance degradation of current satellite radio engineering navigation, communication and radar systems as well as superlong-baseline radio interferometry systems.
    Description: Published
    Description: JCR Journal
    Description: open
    Keywords: total electron content ; GPS ; transionospheric radiochannel ; geomagnetic disturbances ; space weather ; 01. Atmosphere::01.02. Ionosphere::01.02.06. Instruments and techniques
    Repository Name: Istituto Nazionale di Geofisica e Vulcanologia (INGV)
    Type: article
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  • 10
    Publication Date: 2019-11-04
    Description: Global Positioning System (GPS) satellite receivers provide a world-wide network of phase and group delay measurements. The combination of two-frequency measurements can be used to derive the integral of the electron concentration along each satellite-to-receiver path, a parameter known as the Total Electron Content (TEC). At this stage these slant TEC data are diffi cult to interpret as they originate from a combination of a temporally changing ionosphere and spatially changing observation geometry. In this paper TEC data are inverted to evaluate the underlying distribution and time evolution of electron concentration. Accordingly, a new three-dimensional, time-dependent algorithm is presented here for imaging ionospheric electron concentration using GPS signals. The inversion results in a three-dimensional movie rather than a static image of the electron-concentration distribution. The technique is demonstrated using simulated ground-based GPS data from actual measurement geometry over Europe.
    Description: Published
    Description: JCR Journal
    Description: open
    Keywords: ionosphere ; imaging ; GPS ; inversion ; tomography ; 01. Atmosphere::01.02. Ionosphere::01.02.06. Instruments and techniques ; 05. General::05.01. Computational geophysics::05.01.05. Algorithms and implementation
    Repository Name: Istituto Nazionale di Geofisica e Vulcanologia (INGV)
    Type: article
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