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Title: VELOCITY FIELD IN SOUTHWEST BULGARIA OBTAINED FROM GNSS DATA
VELOCITY FIELD IN SOUTHWEST BULGARIA OBTAINED FROM GNSS DATA

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N. Dimitrov; I. Georgiev; P. Danchev
10.5593/sgem2021/2.1/s09.57
1314-2704
978-619-7603-22-4
English
21
2.1
• Prof. DSc. Oleksandr Trofymchuk, UKRAINE
• Prof. Dr. hab. oec. Baiba Rivza, LATVIA
Geodesy and Mine Surveying
The region of southwest Bulgaria is characterized by a large number of fault structures, and the presence of tectonic and seismic activity, thus predetermines the development of dangerous geodynamic processes.
This article discusses the estimates of modern movements of the earth's crust obtained from periodic geodetic measurements. They describe the total effect of fast and slow horizontal and vertical movements. Obtaining such estimates, on the order of mm/y, requires determining the coordinates of the points of the geodynamic geodetic networks with millimeter accuracy. Achieving such accuracy is possible only with the help of modern satellite geodetic technologies.
GNSS data from five continuously operating reference stations belonging to National GNSS network is used in this research. The raw GNSS measurements for three-year-and-a-half period are processed. Time series with coordinates and mean square errors (north, east and up) and time series with the residuals from multi-year solution are estimated. The time series show very good quality of the solution (the values of nrms are smaller than 0.70).
The results for velocities of EPN Densification network, National GPS Network and Geodynamic GPS network around Sofia and Southwest Bulgaria are combined to obtain velocities field in Southwest Bulgaria derived from GNSS measurements. The newly acquired velocity field confirms that the general tendency of movement of the points in the region of Southwest Bulgaria is in the southern direction with respect to stable Eurasia, as a general tendency the velocities increase from North to South. This pattern is in agreement with the extensive movement of southern Bulgaria and northern Greece. The obtained velocity field can be used for further detailed geodynamic and geological investigations of the fault structures in the region.
conference
https://www.sgem.org/index.php/jresearch-article?citekey=Dimitrov20219459465
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21st International Multidisciplinary Scientific GeoConference SGEM 2021
21st International Multidisciplinary Scientific GeoConference SGEM 2021, 16 - 22 August, 2021
Proceedings Paper
STEF92 Technology
SGEM International Multidisciplinary Scientific GeoConference
SWS Scholarly Society; Acad Sci Czech Republ; Latvian Acad Sci; Polish Acad Sci; Serbian Acad Sci & Arts; Natl Acad Sci Ukraine; Natl Acad Sci Armenia; Sci Council Japan; European Acad Sci, Arts & Letters; Acad Fine Arts Zagreb Croatia; Croatian Acad Sci
229-236
16 - 22 August, 2021
website
cdrom
7909
GNSS; crustal movements; geodynamics; velocity field