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  • 1
    Publication Date: 2017-04-04
    Description: Abstract A semi-permanent Global Positioning System (GPS) network of about 30 vertices: Victoria Land Network for DEFormation control (VLNDEF) has been set up since Austral summer 1998 at Terra Nova Bay (TNB) near Ross Sea in Antarctica. A permanent GPS station TNB1 based on dual frequency Ashtech P-code GPS receiver with a Choke Ring Antenna has been installed on a bedrock monument in October 1998 and has recorded continuously until recently. The GPS network has been routinely surveyed every two summers using high quality dual frequency GPS receivers; data, metadata and solutions are available to the scientific community at (http://www.geodant.unimore.it). Results of a distributed session approach applied to process GPS data of the VLNDEF network are presented in this paper, based on Gamit/Globk 10.35 GPS analysis software. An improved reference frame definition was implemented using Globk package in order to compute Antarctic intra-plate residual velocities and to invert the strain field from GPS data in this region. The strain rate obtained from the inversion of VLNDEF GPS data has been computed following the method proposed by Feigl et al. using QOCA (quasi observation combination analysis) 1.34 GPS data analysis package.
    Description: Published
    Description: Hotel Panamericano Buenos Aires, Carlos Pellegrini 551, Buenos Aires, Argentina
    Description: 3.3. Geodinamica e struttura dell'interno della Terra
    Description: restricted
    Keywords: Antarctica ; GPS ; Strain Rate ; Block Model ; 04. Solid Earth::04.03. Geodesy::04.03.07. Satellite geodesy
    Repository Name: Istituto Nazionale di Geofisica e Vulcanologia (INGV)
    Type: Abstract
    Location Call Number Limitation Availability
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  • 2
    Publication Date: 2017-04-04
    Description: The technique of the wavefield polarization is applied to ambient vibrations recorded in the Mefite d’Ansanto area, an important non-volcanic natural emission of low temperature CO2 enriched gases. Twentyfive measurements were performed in the study area, eleven near the emission site and the other fourteen in different sites within an area of 5 km. Polarization is assessed both in the frequency and time domain through the individual-station horizontal-to-vertical spectral ratio and covariance-matrix analysis, respectively. We find a significant tendency of ground motion in the gas emission area to be polarized in the horizontal plane, with a N115 predominant trend. This polarization tends to disappear while moving far from the site. According to previous papers in other study areas, such a directional effect is likely caused by fault-induced fractures and tends to be orthogonal to the fracture strike. The predominant NW–SE regional faulting does not fit the N115 polarization direction. To explain observations, we propose an interpretation in terms of a NE–SW oriented, local transfer fault as inferred from the lineament analysis. The intersection of the damage zone of this fault with the regional NW–SE normal fault system could easily be the responsible for the gas emissions since it favors a locally increased crustal weakness.
    Description: ‘‘Vigor-Geotermia’’ project http:// www.vigor-geotermia.it/
    Description: Published
    Description: 116-123
    Description: 5A. Energia e georisorse
    Description: JCR Journal
    Description: restricted
    Keywords: CO2 gas emission Directional resonance Fault damage zone Lineament analysis ; 04. Solid Earth::04.06. Seismology::04.06.04. Ground motion
    Repository Name: Istituto Nazionale di Geofisica e Vulcanologia (INGV)
    Type: article
    Location Call Number Limitation Availability
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  • 3
    Publication Date: 2017-04-04
    Description: A Global Positioning System (GPS) network of 30 semi-permanent vertices known as the Victoria Land Network for Deformation Control (VLNDEF) was set up in the Austral summer of 1998 in Northern Victoria Land (NVL), including the permanent GPS station of Terra Nova Bay (TNB1), Antarctica. The locations were selected according to the known Cenozoic fault framework, which is characterized by a system of NW[U+2010]SE regional faults with right[U+2010]lateral, strike[U+2010]slip kinematics. The TNB1 permanent GPS station is included within the VLNDEF, and was installed on a bedrock monument in October 1998, it has been recording almost continuously up to the present. The GPS network has been surveyed routinely every two summers, using high[U+2010]quality, dual[U+2010]frequency GPS receivers like Trimble 5700, TopCon GB100, and Ashtech Z-XII. In this study we present the results of a distributed session approach based on Gamit/Globk 10.4 software package applied to the processing of the GPS data of the VLNDEF aimed to obtain the preliminary framework of the active tectonics of this region of Antarctica. An improved reference frame definition was implemented, including a new Euler rotation pole, to compute the Antarctic intra-plate residual velocities. The projection of the residual velocities on the main faults in NVL show present[U+2010]day activities for some faults, including the Tucker, Leap Year, Lanterman, Aviator, and David faults, with right[U+2010]lateral strike[U+2010]slip kinematics and local extensional and compressional components. This active fault pattern divides NVL into eight rigid blocks, each characterized by its relative movements and rigid rotations. These show velocities of up to several millimeters per year, which are comparable to those predicted by plate tectonic theory at active plate margins. During the austral summer 2010, in the framework of the Italian Antarctic campaign, field investigations at 25 geodetic stations were performed both for survey of the instruments and measurements as well as for the geological study necessary to evaluate the geological stability of the sites. Preliminary analysis of the collected structural data showed the stability of most of the investigated stations, thus confirming the proposed active tectonic framework of the NVL at the regional scale.
    Description: Published
    Description: Vienna, Austria 3–8 April 2011
    Description: 3.2. Tettonica attiva
    Description: reserved
    Keywords: Antarctica ; Northern Victoria Land ; Active Tectonics ; GPS data ; Geologic Setting ; 04. Solid Earth::04.07. Tectonophysics::04.07.04. Plate boundaries, motion, and tectonics
    Repository Name: Istituto Nazionale di Geofisica e Vulcanologia (INGV)
    Type: Abstract
    Location Call Number Limitation Availability
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