Browse

The scientific research presented in the article is related to the application of methodologies for monitoring deformations of the Earth's crust. Intensively developing technologies were used, such as GNSS and SAR methods. The Sofia region is among the earthquake zones in Bulgaria. The general conclusion is, that Sofia located in an area characterized by a high seismic risk, with considerable consequences in the case of a strong seismic event. New scientific knowledge about the geodynamics of the region and the ph...

Sea level change and global sea level rise are slow but persistent changes. They should be evaluated as a sign of ongoing climate changes. The Black Sea is a semi-enclosed sea, with the only connection to the world's oceans being the narrow Bosphorus Strait. The influence of climate changes in such an environment will be grater. Sea level observations on the Bulgarian part of the Black Sea are carried out by numerous tide gauge stations. The most indicative of them, with the most complete set of measurements, is t...

In recent years GNSS studies play an increasing role in studding of natural risk hazards and active tectonics. The area of Sofia is part of the broad South-Balkan Extensional Tectonic System. This highly populated area of economic significance, even showing to be not so active as other parts of the System is also affected by natural hazards, as active seismicity, landslides, rock falls, debris, etc. GNSS studies are extremely important for understanding of natural hazards and recent geodynamics of the area, especi...

The monitoring of geodynamic processes with modern GNSS technology in the area of Sofia and Southwest Bulgaria has been going on for more than 25 years. To investigate modern crustal motions in the area, GNSS data obtained between 1996 and 2022 are analyzed to obtain the velocity field for southwestern Bulgaria. Every year, measurements are carried out on a part of the points, and the last measurements were carried out in 2022. For the entire period, monitoring covered 28 stations. To evaluate the new result for t...

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 mus...

This paper covers the activities of creating a database for the study of modern crustal movements in the region of Sofia and Southwestern Bulgaria, including data from GNSS measurements of the geodynamic network and the results of their processing and analysis, data from permanent stations and archive data from Synthetic-aperture radar, processing and obtaining interferometric images. The local archive of GNSS measurement includes: manual sketches of the location of the points; log sheets of the measurement with i...

The Bulgarian northern Black Sea coast is affected by many landslides. Several geodynamic networks have been built to study landslide processes in the northern Black Sea coast. Landslide research is important, as these phenomena can lead to great material damage. Their destructive impact on buildings, engineering structures and disturbances in the resilience of the earth's crust causes enormous economic, environmental, social and other damage, and often takes human lives. A modern tool for monitoring landslides is...

Globally, modern crustal movements are being studied as a priority, a large number of projects are being developed and significant funds are being allocated for the development of research in this field of science. Due to the social importance of the problem, the need to obtain geodetic data on the current activity of the earth's crust is realized. This article examines the study of the temporal movements of the earth's crust and the accumulated stresses in a geologically and seismically active region with the pre...

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 ...

There is observational evidence that the global sea levels are rising and increasing the risk to coastal communities from floods and erosion. Interest in marine sea level research is determine not only by forecasting cataclysms and sea level rising, but also in connection with interdisciplinary studies exploring the causes of this change. The article outlines time series analysis of tide gauge data to solve for short and long-term sea level variations at Varna and Burgas tide gauge stations. The data covered the p...

The study of recent crustal movements is one of the priority areas of the Earth sciences. Geodetic methods occupy a particularly important place in the general complex of measurements and investigations of crustal movements because they provide quantitative information on the condition and development of geodynamic processes. The paper outlines the newly accepted project with main goal monitoring the geodynamic processes in the area of Sofia. This goal will achieve by periodic GNSS measurements over the Sofia geod...

The study of landslides is of particular importance because they can lead to great material damage. The region of the Bulgarian northern Black Sea coast is affected by many landslides and it is important to monitor motions of the major landslides in this area. The paper outline deformation analysis of the landslide processes in the area of ?Dalgiya yar?. It is a landslide circus from the Varna landslide region that covers several active landslides, whose boundaries are overlapping and for that reason are difficult...

Geodynamic processes and seismic activity are considered to be the prime driver of horizontal and vertical movements of the Earth's crust in the Balkan Peninsula. One proven method for continuous monitoring of ground deformations is the use of data from active radar remote sensing. These data are the basis for the creation of interferometric images (IFIs) for quantitatively assessment the recorded ground movements of the Earths? surface within a fixed time interval. For this research a set of IFIs were created for...

Satellite Laser Ranging (SLR) measurements of the geodynamic satellite LAGEOS-1 (LAser GEOdynamics Satellite) for the period January 2000 - June 2013 are processed and analyzed. The analysis are carried out with the Satellite Laser Ranging Processor (SLRP) software, version 4.3, developed in the Department Geodesy of the National Institute of Geophysics, Geodesy and Geography at Bulgarian Academy of Sciences. A new module for parameter estimation using the least squares method was developed to allow flexible treat...