Mila Atanasova-Zlatareva

Bulgarian Academy of Sciences | BAS · Department of Geodesy

The main idea of the present investigation is to study the relationship between post- seismic effects as a result of Petrinja, Croatia earthquake which occurred on December 29, 2020 in some ionospheric parameters. Two types of ionospheric data were used: the critical frequency of the F2 region (foF2), obtained from the vertical sounding of the iono...

At the Northern Black Sea coast of Bulgaria, large numbers of active landslides are located. The situation has changed in the last 30 years since large technogenic load was put on it caused by construction activities in that area. For this reason, tracking activation of the landslides and surface movements in them is a critical task that must be ca...

The goal of the presented research was to establish sound basis for studying the current geodynamic processes at single landslide area located between the villages of Topola and Bozhurets at the Bulgarian Black Sea coast. The investigated zone has been under high anthropogenic pressure in the last decade by constructing several touristic and holida...

The prime focus of the current article is to present a pilot study in the project "Study of co-seismic deformations of the Earth's crust for the territory of the Balkan Peninsula based on satellite data" that started in December 2023. The purpose of the project is the regular monitoring of co-seismic deformations of the Earth's crust using innovati...

In this study the effect of hazardous geodynamic processes in the area around the city of Sofia is investigated using radar satellite data. The area is of particular interest due to its high population density and high concentration of industrial facilities and residential areas. This highlights the importance of the study area in societal aspect....

Two devastating earthquakes of magnitude MW 7.8 and MW 7.5 hit Turkey on February 6, 2023. The earthquakes occurred in the East Anatolian Fault Zone, westwards of Gaziantep, Turkey. The quake was followed by intensive aftershock activity. This study presents initial results from interferometric processing of SAR data from the European Space Agency...

The geological conditions along the Northeast Black sea coast of Bulgaria are favorable for landslides emergence and development. Those processes have been rigorously documented in the last fifty years by Earth science researchers. Their efforts contributed in a broader context to the landscape conservation and to mitigate the risks for the populat...

Background and justification: In the last two decades operational Earth observations by satellite synthetic aperture radar (SAR) instruments has resulted in provision of new opportunities for development of new downstream services in terms of all weather data delivery, enlargement of imaged areas and significantly decrease of the revisiting time. D...

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...

The provision of safe operation is of prime importance for every industrial plant. This consideration to an even greater extent concerns the nuclear power plants. One of the major threats during their normal operation for this infrastructural objects are the ground motions that could occur, because of several reasons such as seismic activities, geo...

The Bulgarian northern Black Sea coast is affected by many landslides. Landslide research is important as these phenomena cause loss of human lives and infrastructural damages. For this study a landslide area called "Dalgiya yar" was selected. The objective of this study is to provide solid grounds for monitoring the landslide processes using GNSS...

In this paper we used synthetic aperture radar (SAR) data to investigate the surface displacements in the area of archaeological site Solnitsata dated VI-V millennium BC. The researched zone is situated in the neighborhood of the Provadia town, NE Bulgaria found and is considered to be one of the most ancient in Europe. Close to it the industrial M...

Studying Earths’ surface motions using data acquired by active instruments such as satellite Synthetic Aperture Radar (SAR) have become ubiquitous in the last years. This trend could be attributed to large extent to the open data policy of ESA that provides such type data from Sentinel-1 mission at no cost from several online repositories. On the o...

We present a preliminary analysis of DSM/DTM from a UAS survey conducted in 2020 of the recently activated Thracian Cliff landslide located in the northern Bulgarian coastal zone. The 3D models have been generated by Px4D mapper software using the Structure-from-motion (SfM) method. The resulting high-resolution digital models can be used to map an...

Landslides are geological phenomena that are spread on Bulgarian territory mainly along the northern Black Sea coast and on the right banks of the Danube in the western part of the country. Mitigation of the negative effects of these destructive geological phenomena is the compilation of inventory maps of their distribution and registers with the m...

In this paper are presented the results from the investigations of the active landslide, located in front of the Thracian Cliffs golf club (Northern Bulgarian Black Sea Coast) for the period 2019–2021. Extensive research by means of in-situ and remote sensing has been carried out on the latest landslide activations. As part of the study, a control...

Impact on the process of landslide origin and activation is result of many factors both endogenous and exogenous. The purpose of this study is to provide possibility for analysis and assessment of the geo-processes in the “Dalgia yar” landslide located at Northern Black Sea coast of Bulgaria in order to prevent risks and disasters of natural and an...

The availability of verified information concerning hazardous geo-processes is of prime importance in monitoring active or potential landslides since they largely affect human lives, infrastructure, and ecological status. Based on data from the Bulgarian national authority in charge of inventories, the landslides number has been constantly increasi...

Landslide processes are considered to be the major part of the natural hazards occurring on the northern part of the Bulgarian sea side. Their monitoring can be done with high precision using GNSS data. The objective of this study is to provide solid grounds for monitoring of the landslide processes using GNSS and SAR data. This goal will be achiev...

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...

The solar activity cycles affect various parameters of surface areas, including rains, snow covers, river streamflows and other hydrological cycles. These processes are due mainly to the total solar irradiance variations, followed by weather and climate changes. The interconnection between the solar cycles and decadal changes of rainfalls over Bulg...

Satellite radar instruments deliver SAR data that are able to provide information on the magnitude of ground motions in range of centimeters. Such information is of extreme importance is assessing the consequences of natural or man-made disasters. Since earthquakes are occurring constantly and are not possible to predict it is recognized that any i...

The territorial distribution of landslides along the Northern Bulgarian Black Sea coast has been evaluated by analyzing the results of field surveys for 2018 and 2019 based on geological surveys and processing of interferometric images from synthesized aperture radars (SAR). A local image archive of Sentinel-1A / B was created for the period 2015 -...

Landslide processes are considered to be the major part of the natural hazards occurring on the northern part of the Bulgarian sea side. Their monitoring can be done by direct measurements in dedicated GNSS networks, which is the most accurate method. The objective of this study is to provide solid grounds for monitoring of the landslide processes...

The landslides are one of the well-known natural hazards occurring on the North East Black Sea coast of Bulgaria. The previous researches that take into account the geological and meteorological peculiarities of this region confirmed that the geomorphological conditions in this region are extremely favorable for landslide formation. Two are the mai...

Summary: The study of landslides is of particular importance because these phenomena can lead to great material damage. Northern Black Sea coast is an important economic area and is driven by well-developed tourism. The region is affected by many landslides and it is important to monitor motions of the major landslides in the area. A preliminary st...

The main reason of landslide activation is rising of groundwater, saturation by rain, water infiltration and snow melting. One part of landslides in Northeast Bulgaria starts after heavy rainfalls, as was evident during the last 20-year wet period. The interconnection between the landslides in Northeast Bulgaria, rainfalls and groundwater maxima is...

The goal of this study is estimation of relative Euler rotation vectors and Euler poles with respect to the Eurasia stable plate on the base of estimated GPS velocities of 26 GNSS permanent stations on the territory of Bulgaria and nearby, and determination of boundaries of eventual microplates. GPS stations data have been processed with the Bernes...

The Trifon Zarezan landslide is one of the well-studied areas north of Varna. It has been registered in 1998 and monitored since then, but due to expansion of construction activities and lack of sewerage facilities in 2005 it exhibited strong activation seriously damaging the panoramic coastal road remaining closed up to nowadays. One important iss...

Earthquakes are a natural disaster causing damage that is measured by human lives and destruction of natural and infrastructural sites. The direct consequences of their occurrence are tsunami, landslides activation, earth ruptures and ground vibrations. An important task after the occurrence of such event is preparation of a plan to manage them, ba...

Motivation it is recognized that landslide is a widespread and problematic geo-hazard worldwide multi-temporal differential SAR interferomery (DInSAR) has proven to be reliable method to monitor landslides SAR data not weather conditions dependent subsidence is defined as “ground surface with not much or no horizontal motion” make use of free to...

The Copernicus Training and Information Session to be held on 17 April 2018 in Sofia, Bulgaria, is part of a series of national Copernicus events. The European Commission is organising the Sessions at the request of, and in collaboration with Member States. The event aims to promote awareness of the many uses of Copernicus data and information.

Various global and arc-dependent parameters are estimated by analyzing Satellite Laser Ranging (SLR) data of the geodynamic satellites Lageos 1 for the period April 1984 – December 2011 and Lageos 2 for the period January 1993 – December 2011. The SLR data are collected from 113 globally distributed stations and are processed and analyzed with SLRP...

Summary: The Trifon Zarezan landslide is one of the well-studied areas north of Varna. It has been registered in 1998 and monitored since then, but due to expansion of construction activities and lack of sewerage facilities in 2005 it exhibited strong activation seriously damaging the panoramic coastal road remaining closed up to nowadays. One impo...

One of the key input parameters in obtaining end products from SAR data is the DEM used during their processing. This holds true especially when persistent scatterers InSAR method should be applied for example to study slow moving landslides or subsidence. Since nowadays most of the raw SAR data are of space borne origin for their correct processin...

Poster presented at FRINGE’2017

Three microplates in Bulgaria are inferred on the base of estimation of relative Euler rotation vectors and Euler poles with respect to the Eurasia stable plate and they fit very well with the tectonic setting of the territory of the country. GPS data from 26 GNSS permanent stations on the territory of Bulgaria and nearby have been processed with t...

The InSAR technique provides fast and accurate means for detecting even small displacements of the Earth's having a magnitude of several centimeters. This method is particularly suitable in monitoring horizontal or vertical movements of natural or anthropogenic origin. The information concerning the shifts is based on solely on the interferograms r...

Crust movements on the territory of Bulgaria and northern Greece are studied on the base of processing of GPS data from 35 GNSS permanent stations and estimation of parameters of Euler pole for the time span 2011–2015. For analysis of the behaviour of the stations, the estimated station coordinates and station velocity components in system ITRF2008...

Crust movements on the territory of Bulgaria and northern Greece are studied on the base of processing of GPS data from 35 GNSS permanent stations and estimation of parameters of Euler pole for the time span 2011-2015. For analysis of the behaviour of the stations, the estimated station coordinates and station velocity components in system ITRF2008...

The work presents a study of the earth crust movements for the territory of Bulgaria and north Greece on the base of new processing of GPS data from 36 GNSS permanent stations on the territory of study. One week data from each year are used from all four years 2011-2014. The estimated station coordinates and station velocity components in system IT...

The solar activity cycles affect various parameters of surface areas, including rains, snow covers, river streamflows and other hydrological cycles. These processes are due mainly to the total solar irradiance variations, followed by weather and climate changes. The interconnection between the solar cycles and decadal climate changes over Balkan Pe...

The modern geodetic observations, based on high-accuracy space techniques, provide decadal time series of station coordinates. These time series are suitable to detect and research small ground motion due to local and global geodynamical sources. Some space technique stations are collocated and the comparison of their data may reveal common periodi...

The region of Balkan Peninsula and in particular, the territory of Bulgaria characterizes with active tectonics and seismotectonics. A number of geological, geophysical and geodetic investigations demonstrate the recent activity of the region, and have tried to give a reasonable and adequate interpretation of the obtained results [2], [4], [6], [8]...