Present day crustal deformation in Romania from continuous and episodic GNSS measurements

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).

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.

PDF iconPresent day crustal deformation in Romania from continuous and episodic GNSS measurements


Developments on the EPOS-IP strain rate product

The main topic is always seismology at the General Assembly of the European Seismological Commission (GA ESC). This year, the 36th Assembly was held in Valletta, Malta, from September 2nd to the 7th , 2018. The event was organized by the Department of Geosciences of the University of Malta, and it brought a new approach: a presentation about the work done by EPOS TCS GNSS Data and Products.

Athanassios Ganas (NOA), an EPOS TCS GNSS member, introduced this TCS by presenting for the very first time the preliminary product which is the strain rate map of western Eurasia. “In this contribution, were presented preliminary results from 452 permanent European GNSS stations, operating until 2017 and processed at UGA-CNRS (Université Grenoble Alpes, Centre National de la Recherche Scientifique)”, says Ganas.

Strain rate field – According to him, to calculate the strain rate field, they used two open-source algorithms recommended by EPOS-IP, namely the VISR (Velocity Interpolation for Strain Rate) algorithm (introduced by Shen et al., 2015) and STIB (Strain Tensor from Inversion of Baselines), developed by Masson et al., (2014) as well as the SSPX software suite (Cardozo and Allmendinger, 2009).

PDF iconDevelopments on the EPOS-IP Pan-European strain rate product

EPOS TCS GNSS Thematic Core Service @ European Plate Observing System

On May 30th until June 1st, 2018, EPOS TCS GNSS Data and Products participated to the EUREF 2018 Symposium, which was hosted in Amsterdam, Netherlands. Therefore, to disseminate this Thematic Core Service, Rui Fernandes, coordinator for EPOS TCS GNSS Data and Products, had been chosen as a representative to speak about EPOS at EUREF Symposium. To leverage EPOS awareness, he started by reminding the audience that “EPOS is a long-term project for the integration of research infrastructures for Solid Science in Europe. Therefore, one of the three priority projects of European Commission within ESFRI”. TCS GNSS Thematic Core Service @ European Plate Observing System