Lyubka Pashova

Bulgarian Academy of Sciences, National Institute of geophysics, geodesy and geography, Associate Professor

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Lyubka Pashova currently works at the Department of Geodesy of the National Institute of Geophysics, Geodesy and Geography - Bulgarian Academy of Sciences (NIGGG-BAS). Lyubka does research in Geodesy
Address: Bulgaria

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Papers by Lyubka Pashova

Homogenized catalog of Black Sea earthquakes from 1905 to 2022 up to 40 km depth

Zenodo (CERN European Organization for Nuclear Research), Jun 22, 2023

Study of local manifestations of strong geomagnetic storms at middle latitude with using geomagnetic and TEC data

EGU General Assembly Conference Abstracts, Apr 1, 2018

Geodynamics

Геодинаміка, Sep 1, 2013

The paper presents an inventory of the available gravity and geomagnetic data for studying geolog... more The paper presents an inventory of the available gravity and geomagnetic data for studying geological structures and geodynamical processes in the Black Sea region. A short analysis of the compiled free-air gravity anomaly map from in situ data of the sea is performed. The geomagnetic data acquisition over the Bulgarian territory and western part of the Black sea is presented. Some new sources of the gravity and geomagnetic data from satellite missions are indicated.

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Compilation of Regional Homogeneous Seismic Catalog for Identification of Tsunamigenic Zones in the Black Sea Region

Geosciences

Although tsunamis in the Black Sea are rare and less destructive, recently, their study has been ... more Although tsunamis in the Black Sea are rare and less destructive, recently, their study has been the subject of interest due to the increasing concentration of population and infrastructure in low-lying coastal areas. This study aims to elucidate the spatial–temporal characteristics of earthquakes in the Black Sea region (27° E–42° E and 40° N–47° N) over a century to clarify the seismicity pattern further to be used for probabilistic seismic and tsunami hazard analysis. Significant volumes of seismic data from international and national databases were analyzed, and the results obtained from previous research were supplemented and expanded. Earthquakes over the period 1905–2022 from eight up-to-date seismic catalogs were used to compile a unified catalog after conversion to the moment magnitude scale Mw. The best-fit linear relationship between several magnitude scales and Mw was determined using the general orthogonal regression (GOR) and the least squares method (LSM). After the d...

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Assessment of the Historical and Recent Seismicity of the Black Sea Region

SGEM International Multidisciplinary Scientific GeoConference EXPO Proceedings, 2021

The study of seismicity in the Black Sea region is of particular interest for assessing the vulne... more The study of seismicity in the Black Sea region is of particular interest for assessing the vulnerability of the surrounding coastal zones to strong earthquakes and their consequences. The seismicity pattern in the area is determined by the geodynamic processes along the boundaries of the Eurasian, Anatolian and Arabian tectonic plates. The paper presents an approach to assessing the seismic activity of the Black Sea and the surrounding region covering historical and recent seismicity. The historical events since after Christ are included in the catalogue compiled in our previous study, which contains 6468 de-clustered events from 1905 to 2021 with a magnitude M>=3. All catalogue data are processed by ZMAP, which is routinely applied in the seismological practice to evaluate catalogue quality and in routine network operations. Based on the Frequency-Magnitude Distribution of the overall catalogue, we compiled the magnitude of completeness Mc, b-value, and probability maps with their error evaluations for the two periods: recent seismicity (1977-2021) and including historical events, respectively. The catalogue data show a significant increase in small to moderate (3.0?M<5.0) earthquakes after 1980. The considerable increase in the number of seismic stations installed in the countries bordering the Black Sea increases the sensitivity to earthquake detection capability. The seismic events are clustered to the strongest (M>=6) earthquakes and outlined the main seismic zones: Shabla-Kaliakra, the Crimean peninsula, three clusters located on the eastern shores of the Black Sea, and one on the southern coast near Bartin, Turkey. These seismic zones outline tectonic units, with specific seismicity patterns in the locations of the clusters.

Combined geodetic and tectonic study of the region southeast of Sofia

Geologica Balcanica, Mar 30, 2002

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Tsunami research in Bulgaria: recent developments, gaps and further directions

Tsunamis are a severe hazard that results in many deaths and damage to infrastructure, especially... more Tsunamis are a severe hazard that results in many deaths and damage to infrastructure, especially along the coasts of tsunami-prone areas along the World Ocean coast. The Black Sea is an inland sea surrounded and intersected by many active faults and geodynamic features that can generate tsunamis.
Tsunami events are rare in this sea basin, although evidence of such events is described in historical chronicles and recorded over the past century through continuous sea level observations with tide gauges constructed along its coast. We present findings from a synthesis of the studies from the last four decades on tsunamis along the Bulgarian Black Sea coast with broader implications for natural disaster risk management. The overview defines the available gaps and shortcomings in providing necessary input data to model and simulate such events caused by various sources. We highlight the key issues to be addressed and provide some recommendations for the prospects of tsunami research in the Black Sea, focusing on the sustainable maintenance and management of an early warning system for natural hazards in the coastal zone.

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Review of Bulgarian Space-Related Activities Within the Geo Initiative and the Eu Copernicus Program

The free and open data policy of the Group on Earth Observation (GEO) and the EU Copernicus progr... more The free and open data policy of the Group on Earth Observation (GEO) and the EU Copernicus program helps many Bulgarian scientists, start-ups, and SMEs to choose Earth Observation (EO) data as a core for their research projects, development of applied products and services. This review summarizes the organizational activities undertaken at different levels to coordinate the efforts of stakeholders for technological development and innovation in the field of space in Bulgaria, directly or indirectly related to the use of EO over the past three decades from a scientific point of view. Bulgarian participation in GEO and ESA Plan for European Cooperative State (PECS) Agreement is also discussed. A review of normative documents, international agreements, the country's participation in space-related programs, research and applied projects, organizational activities, educational initiatives, and training is carried out. The main challenges facing the scientific community in Bulgaria a...

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Study of Length Differences from Topography to Map Projection Within the State Coordinate Systems for Some Countries on the Balkan Peninsula

All geodetic measured quantities from the physical surface of the Earth are reduced to the geoid ... more All geodetic measured quantities from the physical surface of the Earth are reduced to the geoid and surface of adopted reference ellipsoid through applying corrections on the measured values, as well projected to the map projection. Before calculating the Cartesian coordinates of points in a formal state geodetic coordinate system, the horizontal lengths between points on the topography surface first should to be reduced from the topography to the mean see level (geoid), then from the geoid to the reference ellipsoid, and after that projected from the ellipsoid into the map projection. Up to now, within the research analyses have been performed for defining of most appropriate State Plane coordinate system, the choice of most suitable national map projection is based on the requirements of accurate representation of the earth surface on the plane with minimum distortions. This choice is usually based on the research analyses performed for defining of most appropriate State Plane coordinate system. During the literature review, analyses of the length changes between points within successive projections from the earth surface to the chosen state map projection were not found. Recognition of the length differences for whole country areas mapped on the State Plane coordinate system are very important data for many geodetic and cartographic applications. This research aims to develop and provide national GIS datasets of lengths&#39; differences on a grid with cells 1x1 km covering national territories of seven Balkan countries-Albania, Bosnia and Herzegovina, Bulgaria, Croatia, Kosova, FYRo Macedonia and Montenegro. Assessment and comparison of successive length differences between four surfaces (from the Earth surface, through geoid and ellipsoid, to the map projection) have been realized through calculation of mean linear deformations of 1km lengths, dispersion, maximum and minimum values, as well as their positive, negative or zero values. The differences between the real length on earth surface and on a map projection due to elevation factor were evaluated, that gave an impression on the quality of state geodetic coordinate systems, of the seven analyzed countries.

Application of UAS for the purposes of landslide mapping in Bulgaria – a case study of the Thracian Cliff landslide, northern Bulgarian coastal zone

Abstracts of the ICA, 2021

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REVIEW OF BULGARIAN SPACE-RELATED ACTIVITIES WITHIN THE GEO INITIATIVE AND THE EU COPERNICUS PROGRAM

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Surveys, Catalogues, Databases/Archives, and State-of-the-Art Methods for Geoscience Data Processing

Knowledge Discovery in Big Data from Astronomy and Earth Observation

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Analysis of the Dynamics of Built-Up Areas and Artificial Impervious Surfaces of the Bulgarian Coastal Municipalities Using GHSL and Gaia Data

Socio-economic development and intensive urbanisation in coastal areas in many parts of the world... more Socio-economic development and intensive urbanisation in coastal areas in many parts of the world in recent decades have led to a rapid increase in built-up areas. These activities have negatively affected the environment and upset the balance in the vulnerable coastal ecosystems. The Global Artificial Impervious Areas (GAIA) data analysis indicates an Artificial Impervious Surfaces (AIS) increase of 1.5 times since 1990. Since the 1960s, AIS has been dynamically expanded along the Bulgarian coastal zone. The main factors contributing to increasing AIS are urbanisation, industrialisation and tourism development processes. This study aims to assess the dynamics of impervious surface Bulgarian coastal region in the period 1975-2018, the not studied in detail so far. The analysis is carried out for the Black Sea coastal municipalities using Google Earth Engine platform of the Global Man-made Impervious Surface (GMIS), GHSL (JRC-EC) and GAIA data. Some inferences about the temporal tren...

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Challenges and Solutions for Utilizing Earth Observations in the "Big Data" era

The ever-growing need of data preservation and their systematic analysis contributing to sustaina... more The ever-growing need of data preservation and their systematic analysis contributing to sustainable development of the society spurred in the past decade, numerous Big Data projects and initiatives are focusing on the Earth Observation (EO). The number of Big Data EO applications has grown extremely worldwide almost simultaneously with other scientific and technological areas of the human knowledge due to the revolutionary technological progress in the space and information technology sciences. The substantial contribution to this development are the space programs of the renowned space agencies, such as NASA, ESA, Roskosmos, JAXA, DLR, INPE, ISRO, CNES etc. A snap-shot of the current Big Data sets from available satellite missions covering the Bulgarian territory is also presented. This short overview of the geoscience Big Data collection with a focus on EO will emphasize to the multiple Vs of EO in order to provide a snapshot on the current state-of-the-art in EO data preservatio...

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Spatial Database Designing for Environmental Monitoring and Decision Making in Mitrovica Region, The Republic of Kosovo

Geosfera Indonesia

The integration of spatial data analysis methods and thematic map models is an approach to reduce... more The integration of spatial data analysis methods and thematic map models is an approach to reduce the negative impact of anthropogenic pressure on the environment due to mining and waste generation. The large amounts of industrial waste from mining in the Mitrovica region in northern Kosovo lead to serious environmental problems with organic and inorganic water and soil pollution. This study aims to design and establish a geospatial database for long-term environmental monitoring, provide analytical tools, and support appropriate management decisions by local authorities and agencies. The database contains topographical elements and ecological parameters collected from different national and open access international sources. All collected data have been analyzed, standardized and harmonized within the open-source QGIS ver.3 software. The results showed that in developed datasets were organized in different GIS layers and compiled several thematic maps. The designed database is uniq...

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Conceptual Framework for Educational Disaster Centre “Save the Children Life”

ISPRS - International Archives of the Photogrammetry, Remote Sensing and Spatial Information Sciences, 2015

Millions of people are affected by natural and man-made disasters each year, among which women, c... more Millions of people are affected by natural and man-made disasters each year, among which women, children, elderly persons, people with disabilities or special needs, prisoners, certain members of ethnic minorities, people with language barriers, and the impoverished are the most vulnerable population groups in case of emergencies. Many national and international organizations are involved in Early Warning and Crisis Management training, particularly focused on the special target to safe children and improve their knowledge about disasters. The success of these efforts is based on providing the specific information about disaster preparedness and emergency in adapted for children educational materials, accompanied with simple illustrative explanations for easy and fast understanding of the disasters. The active participation of the children in the educational activities through appropriate presenting the information, short training seminars and entertaining games will increase their ...

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Gravity and geomagnetic data for studying geological structures and geodynamical processes in the Black Sea region Гравиметрични и геомагнитни данни за изучаване на геоложки структури и геодинамични процеси в Черноморския регион

Geodynamic study in the region south of Sofia by GPS

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On the Necessity of Improving the Research Infrastructure in the Western Black Sea for the Purposes of Flood Risk Management

This paper aims to emphasize the necessity to improve the Bulgarian research infrastructure in th... more This paper aims to emphasize the necessity to improve the Bulgarian research infrastructure in the western part of the Black Sea region, which can enhance the capability for more effective flood hazard assessment and risk management in the coastal area. To fulfill the requirements of the Directive 2007/60/EC flood hazard and risk maps of the Areas with Potential Significant Flood Risk (APSFR) for coastal zone have to be prepared. Short overview of the approaches for compiling such maps has been presented as well as all parameters’ evaluations needed and their uncertainties based on the available information and models. Still existing obstacles to the provision of timely geospatial information from monitoring stations along the coastal area are discussed, and some suggestions for improving the research infrastructure in the western part of the Bulgarian Black Sea coast are listed.

Results from geodynamic studies in the Krupnik-Kresna region for the period 2002-2005

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Lyubka Pashova

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