Work done by the GNSS Data & Products Thematic Core Services in the scope EPOS was promoted at the 19th General Assembly of WEGENER 2018 on earth deformation and the study of earthquakes using geodesy and geodynamics. There were two posters (the C4G/UBI contribution for the EPOS GNSS Products Dissemination and the EPOS GNSS Data Gateway: concept and access) and one presentation (Present-day crustal deformation in Romania from continuous and episodic GNSS measurements).
The C4G/UBI contribution for the EPOS GNSS Products Dissemination – This poster presented the efforts carried out by C4G/UBI in the framework of the EPOS (European Plate Observing System) project to support the harmonization and dissemination through a product portal of products derived from GNSS data: position time series, velocity fields and strain rate maps.
The poster was produced by the C4G/UBI team (Machiel Bos, Paul Crocker, Rafael Couto, Rui Fernandes, Rui Cardoso, Hugo Gonçalves, José Manteigueiro, Fábio Pereira and André Rodrigues). It presents that C4G/UBI will validate the velocity solutions computed by the different EPOS/EUREF analysis and combination centres. This is done by 1) comparing the solutions produced by the different methodologies; and 2) analysing each time series by screening for outliers and ensuring that jumps in the time series are being detected. C4G/UBI will be also responsible for estimating proper uncertainties for the velocities using Hector.
The EPOS GNSS Data Gateway: concept and access – The European EPOS GNSS data gateway (temporary address) is designed for accessing data and metadata of ~2000 GNSS stations collected and managed by different local data centers situated all over Europe. Written by the Géoazur/Université Côte d'Azur, CNRS, IRD and Observatoire de la Côte d'Azur team (Mathilde Vergnolle, Jean-Luc Menut, Khai-Minh Ngo, Maurin Vidal, and Lucie Rolland), the poster presents the system architecture based on the GLASS software package developed by five European institutions in the framework of the EPOS TCS GNSS Data and Products, how to use the EPOS GNSS Data Gateway and its status. In particular, it focuses on how to search for data and metadata with the graphical user interface and how to download them.
Present-day crustal deformation in Romania from continuous and episodic GNSS measurements – Alexandra Muntean, from National Institute for Earth Physics, in Romania, presented a study with the results of analysing the continuous and episodic GNSS/GPS measurements in Romania from a homogeneous combination of all networks. This includes monitoring the crustal changes in Romania by correlating them with tectonic processes in South-East Europe and monitoring the crustal movements to shape the surface-to-depth relationships of intermediate-depth earthquakes in the Vrancea region.
At her oral presentation, on September 11th, Alexandra Muntean, also presented an analysis of all available RINEX data processed in daily batches with the "Precise Point Positioning" (PPP) strategy using the GIPSY-OASIS software. “From the resulting position time-series, the horizontal and vertical motion vectors were calculated, relative to a stable Eurasian reference frame”, she explained.
Alexandra Muntean highlighted that “the involvement in the EPOS-IP project as a member of the TCS GNSS Data and Products Working Group helped evolve the groups research approaches as well as test and implement the GLASS software package for the dissemination of GNSS data & dedicated processing outcomes, time-series, velocities, and strain-rates”. According to Alexandra, this knowledge sharing made feasible the use of state-of-the-art methodologies for a better understanding and completion of the tectonic puzzle of Solid Earth processes in this challenging structure of Southeastern Europe.
The 19th General Assembly of WEGENER 2018 took place in Grenoble, France, from September 10th to 13th.
About WEGENER – The concept of WEGENER (Working Group of European Geoscientists for the Establishment of Networks for Earth-science Research) was put forward at a meeting of the Journées Luxembourgeoise de Géodynamique held in Walferdange in 1980 and the consortium was formally established during a meeting at IfAG (Institut Fuer Angewandte Geodaesie), now BKG (Bundesamt für Kartographie und Geodäsie) in Frankfurt early in 1981. It was a voluntary collaboration among a large group of European institutions and individual scientists wishing to cooperate on the application of space and terrestrial geodetic techniques to the study of geodynamics in the Alpine–Mediterranean plate boundary region in the framework of NASA's Crustal Dynamics Project (CDP). Source: WEGENER 2018.
C4G UBI contribution for EPOS GNSS Products Dissemination
EPOS GNSS Data Gateway concept and access
Present day crustal deformation in Romania from continuous and episodic GNSS measurements
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