Peer-reviewed articles 17,970 +


Nikolay Dimitrov
•    Prof. DSc. Oleksandr Trofymchuk, UKRAINE 
•    Prof. Dr. hab. oec. Baiba Rivza, LATVIA
The article summarizes the main geodetic activities performed in the region of Southwestern Bulgaria to study the modern crustal movements and clarify the geodynamic situation of the region. The study area is bounded to the north of the southern slopes of the Balkan Mountains, to the south to the southern slopes of the Rila Mountains, to the west – the western border of Bulgaria and to the east – the beginning of the Upper Thracian plain. The area has a complex geological structure with many active faults that must be studied. The region is of particular interest due to its high population density and high concentration of industrial facilities and resources. The main geodetic method for studying the crustal movements are GPS measurements, their processing and analysis of the results. To study the modern crustal movements in 1996- 1997, a geodynamic network was built that cover Southwestern Bulgaria. The network is designed for precision GPS measurements, determination the velocities of points and calculation of active strain. The results for velocities and strain rates of longtime monitoring are given. The velocities of the points are between 1.5mm/y of the northern most station and slightly over 3mm in the southern most station. The obtained result for strain rate field shows dominating N-S extension and the deformation is not uniformly distributed over the area. The strain rate field result confirms that the movement of points in the region of southwestern Bulgaria is in a southerly direction relative to stable Eurasia. This extensive movement of southern Bulgaria and northern Greece is also confirmed. Due to the long period of measurements the results are highly reliable and can be used for detailed geodynamic and geological study of the active fault structures in the region.
[1] Burchfiel, B. C., R. Nakov, Tz. Tzankov, L. H. Royden (2000). Cenozoic extension in Bulgaria and northern Greece: The northern part of the Aegean extensional regime: in Bozkurt, E., Winchester, J. A., and Piper, J. D. A., (eds), Tectonics and Magmatism in Turkey and the Surrounding Area: Geological Society Special Publication No. 173, p. 325-352.
[2] Yosifov, D., I. Paskaleva, E. Botev, B. Rangelov (2018) The seismic risk for Sofia. NTS MDGM, S., 207. (In Bulgarian)
[3] Radulov, A., M. Yaneva, S. Shanov, K. Kostov, V. Nikolov, N. Nikolov (2012). Coseismic geological effects related to the May 22, 2012 Pernik earthquake, Western Bulgaria. In: Proceedings of the National Conference “Geosciences 2012”, Bulgarian Geological Society, Sofia, 121–122.
[4] Dimitrov N, I. Georgiev, Nakov R. (2020) Monitoring of geodynamic processes in the area around Sofia. SGEM, Volume 20, Book 2.2, 18-24 August, Albena, Bulgaria, ISBN:978-619-7603-07-1, ISSN:1314-2704, DOI:10.5593/sgem2020/2.2/s09.010, p 79- 86.
[5] Kotzev, V., R. Nakov, B. C. Burchfiel, R. W. King. (2001). GPS constraints on the kinematics of southwestern Bulgaria. - C. R Acad. Bulg. Sci., 54, 7, 51-54.
[6] Kotzev, V., R., Nakov, Tz., Georgiev, B.C., Burchfiel, R.W., King (2006). Crustal motion and strain accumulation in western Bulgaria. – Tectonophysics, 413 (3-4), 27- 145.
[7] Dimitrov N, R. Nakov. (2020). Recent GPS results on the geodynamics of the area around Sofia (Central-Western Bulgaria). Review of the Bulgarian Geological Society, 3, 81, 2020, ISSN: 0007-3938, 241-243.
[8] Dimitrov N., R. Nakov. (2021). Supplementary measurements in the Sofia Geodynamic Network. Significance for contemporary local and regional geodynamics. Review of the Bulgarian Geological Society, 82, 3, 239–241;
[9] Herring, T. A., R. W. King, M. A. Floyd, S. C. McClusky. 2018. GAMIT reference manual, GPS Analysis at MIT, Release 10.7. Cambridge, MA: Massachusetts Institute of Technology.
[10] Herring, T. A., M. A. Floyd, R. W. King, S. C. McClusky. 2015. GLOBK reference manual, Global Kalman filter VLBI and GPS analysis program, Release 10.6. Cambridge, MA: Massachusetts Institute of Technology.
[11] Dimitrov N, Nakov R. (2022). GPS Results from Long Time Monitoring of Geodynamic Processes in South-Western Bulgaria. Applied Sciences. 2022; 12(5):2682.
[12] Lyard, F., Lefevre, F., Letellier, T., Francis, O. Modeling the global ocean tides: Modern insights from FES2004. Ocean Dy-namics, 56, 394–415. 2006.
[13] QOCA Homepage,, last accessed 2021/06/06.
[14] 7. Barrier, E., N. Chamot-Rooke, G. Giordano (2004). Geodynamic map of the Mediterranean. Sheet 1-Tectonic and Kinematics. CGMW, France.
[15] Dimitrov N., R. Nakov. (2021). Strain Accumulation in Southwest Bulgaria Derived From GNSS Measurements. Proceedings of 21th International Multidisciplinary Scientific GeoConference SGEM 2021, 21, 2.1, International Multidisciplinary Scientific GeoConference, 2021, ISSN:1314-2704, DOI:10.5593/sgem2021/2.1/s09.53, 427-433.
This paper has been made available with the financial support provided by National Science Fund, call identifier “Competition for financial support of basic research projects – 2019” Project "Monitoring of geodynamic processes in the area of Sofia". Contract No КП-06-H 34/1.
Proceedings of 22nd International Multidisciplinary Scientific GeoConference SGEM 2022
22nd International Multidisciplinary Scientific GeoConference SGEM 2022, 04 - 10 July, 2022
Proceedings Paper
STEF92 Technology
International Multidisciplinary Scientific GeoConference SGEM
SWS Scholarly Society; Acad Sci Czech Republ; Latvian Acad Sci; Polish Acad Sci; Serbian Acad Sci and Arts; Natl Acad Sci Ukraine; Natl Acad Sci Armenia; Sci Council Japan; European Acad Sci, Arts and Letters; Acad Fine Arts Zagreb Croatia; Croatian Acad Sci and Arts; Acad Sci Moldova; Montenegrin Acad Sci and Arts; Georgian Acad Sci; Acad Fine Arts and Design Bratislava; Turkish Acad Sci.
04 - 10 July, 2022
GPS, geodynamic, crustal movements, strain rate