Abstract
Recognizing the fact that the region around the capital belongs seismically in one of the most vulnerable areas in the Republic of Croatia, the interdisciplinary geodynamic research was initiated which lasts for 18 years now. Since the establishment of the geodynamic network, ten series of precise GPS measurements on specially stabilized points of the geodynamic network were conducted in order to determine tectonic movements and related seismic activities in the wider Zagreb area. From all conducted measurements in the period from 1997 to 2015, the original geodetic model of tectonic movements was created. Following the analysis of geodetic and geological data, a unique interdisciplinary surface layers movement model of the research area was determined. During the 2015, PSInSAR (Persistent Scatterer InSAR) technology was included in the research and was combined with the GPS measurements. The paper describes the combination of these two methods for the period 2004 - 2009 which resulted in denser and more reliable movement model in the urban part of the research area, especially in its height component, which is very important for the safety of buildings.
Highlights
This paper is the result of integrating all of the collected data from eighteen years’ research of interdisciplinary scientific team which focused on the monitoring and study of geodynamic processes of the wider area of the City of Zagreb
GPS technology in the last twenty years has established itself as a major geodetic contribution to the geodynamic research [3], and the establishment of the respective geodynamic network, in 1997, opened the space for development of the geodynamic project to monitor tectonic movements in the Zagreb mountain Medvednica and boundary areas of several important tectonic units that meet in the wider Zagreb area [4, 5]
The geodynamic research in the wider Zagreb area started in 1997 with the project "Geodynamic GPS Network of the City of Zagreb" and, since 10 GPS campaigns have been conducted on the network points with the aim to determine the geodynamically induced ground deformations in the area
Summary
This paper is the result of integrating all of the collected data from eighteen years’ research of interdisciplinary scientific team which focused on the monitoring and study of geodynamic processes of the wider area of the City of Zagreb. GAMIT/GLOBK uses Kalman filter to determine the velocities from the discrete GPS campaigns This software gives multipoint solutions, all the point velocities are processed at once and the covariance matrix is common to the entire network [11]. To obtain a cumulative model of velocities of points of the observed area for the entire period from 2004 to 2009, in further processing of the data it was necessary to combine the resulting solution of each individual campaign. Results are interferograms, which can be used for monitoring different geophysical and surface processes occurring on the Earth’s surface, such as earthquakes, vulcanic eruptions, landslide, uprising and subsidence events, glacial movements and etc With this technique, it is possible to achieve a determination of ground surface deformations with sub-centimeter accuracy, over an area of interest in period of a few days to several years. This process was referred to as Interferogram Stacking. [16] The two most used multi-stacking techniques are Small Baseline Subset (SBAS) and Persistent Scatter (Ps) technique
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