Abstract
Permanent Global Navigation Satellite Systems (GNSS) reference stations are well established as a powerful tool for the estimation of deformation induced by man-made or physical processes. GNSS sensors are successfully used to determine positions and velocities over a specified time period, with unprecedented accuracy, promoting research in many safety-critical areas, such as geophysics and geo-tectonics, tackling problems that torment traditional equipment and providing deformation products with absolute accuracy. Cyprus, being located at the Mediterranean fault, exhibits a very interesting geodynamic regime, which has yet to be investigated thoroughly. Accordingly, this research revolves around the estimation of crustal deformation in Cyprus using GNSS receivers. CYPOS (CYprus POsitioning System), a network of seven permanent GNSS stations has been operating since 2008, under the responsibility of the Department of Lands and Surveys. The continuous flow of positioning data collected over this network, offers the required information to investigate the behavior of the crustal deformation field of Cyprus using GNSS sensors for the first time. This paper presents the results of a multi-year analysis (11/2011–01/2017) of daily GNSS data and provides inferences of linear and nonlinear deforming signals into the position time series of the network stations. Specifically, 3D station velocities and seasonal periodic displacements are jointly estimated and presented via a data stacking approach with respect to the IGb08 reference frame.
Highlights
The use of permanent Global Navigation Satellite Systems (GNSS) networks offers the potential to continuously observe the motion of Earth-fixed stations
The linear signal is of great interest for geodynamical studies as it represents the dominating effect caused by tectonic plate motion and post-glacial rebound on the horizontal and vertical station displacements, respectively [5]
GNSS Continuously Operating Reference Stations (CORS) stations can be divided in three main categories [30]: Tier-1 CORS are stations used by ultra-high accuracy networks, such as the International GNSS
Summary
The use of permanent Global Navigation Satellite Systems (GNSS) networks offers the potential to continuously observe the motion of Earth-fixed stations This enables precise monitoring of crustal displacements through the analysis of position time series derived from daily or weekly GNSS network adjustments under identical processing options for each session solution. The choice of the global GNSS-based frame IGb08, instead of ITRF2008, is made to ensure maximum consistency with the precise geodetic products (satellite orbits, clocks) that were used during the GNSS data processing Both of the above outcomes have been further analyzed to infer the local deformation field in the network of CYPOS and the presence of seasonal signals in the respective time series of the network stations. The main findings are presented of this research in detail
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