Ivan Georgiev

Ivan Georgiev
Bulgarian Academy of Sciences | BAS · National Institute of Geophysics, Geodesy and Geography

DSc

About

66
Publications
8,806
Reads
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2,313
Citations
Citations since 2017
28 Research Items
671 Citations
2017201820192020202120222023020406080100120
2017201820192020202120222023020406080100120
2017201820192020202120222023020406080100120
2017201820192020202120222023020406080100120

Publications

Publications (66)
Conference Paper
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...
Article
Full-text available
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...
Article
Full-text available
The paper deals with some problems when applying a correction to reduce the effect of vertical refraction in precise leveling observation. An example for calculating the refraction correction for one first order leveling line with length of 109 km in Bulgaria is given. Comparison between the obtained errors before and after applying refraction corr...
Conference Paper
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...
Conference Paper
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...
Article
The western limb of the Hellenic Arc defines the boundary of a large intracontinental active extensional domain covering the Aegean and the southwestern part of the Balkan peninsula. Along this boundary a transition from collision in the north to subduction in the south is associated with post-Miocene clockwise rotations of ∼50∘. We present a new G...
Article
Full-text available
А classical 2D geodetic datum, Bulgarian Coordinate System 1970 is realized through the National Triangulation and still used for many surveying purposes, though the new BGS2005 has already been introduced. A comprehensive study of the 1970 datum has been carried out based on intercomparison of two coordinate sets of identical points, referred to t...
Article
Full-text available
The EUREF Permanent Network Densification is a collaborative effort of 26 European GNSS analysis centers providing series of daily or weekly station position estimates of dense national and regional GNSS networks, in order to combine them into one homogenized set of station positions and velocities. During the combination, the station meta-data, in...
Conference Paper
The effect of atmospheric refraction on the results of precise leveling measurements is investigated. This study is based on level measurements for 30 km line provided by Geodesy, Cartography and Cadastre Agency. The results show that refraction’s impact is not eliminated with one and the same positive and negative differences of elevation. The cor...
Conference Paper
Full-text available
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...
Conference Paper
Full-text available
The NATIONAL GEOINFORMATION CENTER (NGIC) is a newly established scientific infrastructure for cooperation and integration of human resources, informational products and data from monitoring networks and observatories, their complex analysis and implementation into services to the community. It is part of the National road map for scientific infras...
Conference Paper
Full-text available
Climate changes and global warming are assumed for main reasons of constant sea level rise. Survey methods such as altimetric measurements are essential for determining global processes related to sea level change, but the regional and local changes are also important. In this paper regional sea level changes at tide gauge station Varna at Black se...
Conference Paper
Full-text available
The paper outlines time series analysis of tide gauge data to solve for short and long term sea level variations at the Varna tide gauge station. The data covered the period 1928-2018. The measurements have started at 1928 using mechanical floating tide gauge type A. Ott-Kempten. In 2013 a radar tide gauge type Vega Plus with web interface was inst...
Article
Some problems have been investigated when applying a correction to reduce the effect of vertical refraction when precise leveling is performed. The obtained results show that the correction has to be calculated for each setup. It is not eliminated when passing the same positive and negative differences of elevation. Inaccurately measured temperatur...
Conference Paper
Full-text available
Satellite laser ranging measurements of the geodynamic satellite LAGEOS-1 for the period January 2002-June 2013 are processed and analyzed. The analysis are carried out with the Satellite Laser Ranging Processor (SLRP) software developed in the Department Geodesy of the National Institute of Geophysics, Geodesy and Geography at BAS. A new module fo...
Poster
Full-text available
Bulgarian broadband seismological station LIVV was installed on 19.12.2015 near the Bulgarian Antarctic Base “St. Kliment Ohridski” on Livingston Island. During the first deployment period in astral summer 2015-2016 more than 2000 events of different nature are recorded. About 200 of these events are identified as local, regional and teleseismic ea...
Article
Full-text available
The laser ranging data of geodynamic satellites Lageos 1 from the period April 1984- December 2011 and Lageos 2 from the period January 1993 - December 2011 are processed and analyzed. The total number of observations used is 2292315, 2265568 of them are three minutes normal points, and 29747 are single shots from 113 SLR sites.The processing of th...
Conference Paper
Full-text available
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...
Article
Full-text available
Bulgarian broadband seismological station LIVV was installed on 19.12.2015 near the Bulgarian Antarctic Base “St. Kliment Ohridski” on Livingston Island. During the first deployment period in astral summer 2015-2016 more than 2000 events of different nature are recorded. About 200 of these events are identified as local, regional and teleseismic ea...
Conference Paper
Full-text available
First stage of the project “Creating an information base for study of seismicity and Earth’s structure on Livingston Island and surroundings through complex research in the Bulgarian Antarctic Base area”, supported by the Science Research Fund to Bulgarian Ministry of Education and Science, was implemented from December 2015 until February 2016 in...
Poster
Full-text available
The scientific information is the latest and one of the best bedrock on which effective policy to combat and cope with natural disasters have to be built. Understanding, monitoring and information for future natural disasters are the way to assist the government and society. Different types of networks provide reliable information on various natura...
Research
Full-text available
BGC2005, the new Bulgarian Geodetic System 2005, was formally introduced in 2010. One of its most important components is the 3D coordinate system realized through the National GPS Network with the purpose to set a precise and homogenous frame, compatible to current and perspective technology requirements and geodetic standards in Europe and worldw...
Article
We present a new GPS velocity field covering the peri-Adriatic tectonically active belts and the entire Balkan Peninsula. From the velocities, we calculate consistent strain rate and interpolated velocity fields. Significant features of the crustal deformation include (1) the eastward motion of the northern part of the Eastern Alps together with pa...
Conference Paper
Full-text available
Study of seismicity and Earth's structure on Livingston Island and surrounding area is carrying out in the frame of the project " Creating an information base for study of seismicity and Earth's structure on Livingston island and surroundings through complex research in the Bulgarian Arctic Base area " supported by the Science Research Fund to Bulg...
Poster
Full-text available
Radiation risks may transcend national borders, and international cooperation serves to promote and enhance safety globally by exchanging experience and by improving capabilities to control hazards, to prevent accidents, to respond to emergencies and to mitigate any harmful consequences. International safety standards provide support for states in...
Article
Fault plane solutions for 128 earthquakes registered by the modern national seismological network of Bulgaria are presented. Geodynamic analysis is performed and some correlations with other geological, geophysical and geodetic results are analyzed. The obtained prevail extensional stresses in Bulgarian territory are explained by two regional geody...
Article
On 22nd of May 2012 an earthquake with magnitude Мs=5.8 occurred in the town of Pernik about 20 km SW from the capital Sofia causing moderate damages in a wide area including the main city. According to the reports of the seismological agencies and the rapid determination of Bulgarian national seismic network the depth of the event is shallow - abo...
Conference Paper
Some results from the geodetic and seismological monitoring of a part of North-Eastern Bulgaria are presented. To evaluate the deformations in the region of Mirovo salt deposit we apply the precise method of permanent survey of displacements using GPS technology. The results of this monitoring show the velocity of displacement for the last 3 years...
Conference Paper
GPS data from permanent sites in Bulgaria and the Balkans are used to monitor crustal motions and to constrain the regional geodynamics. Data from more than 70 permanent sites in Bulgaria and surrounding regions are processed and analyzed by GAMIT/GLOBK to obtain horizontal velocities. The results show overall motion in south Bulgaria and northern...
Article
The presentation outlines results for horizontal motion of the crust in the Balkans, mainly Bulgaria and Northern Greece, obtained by processing and analyzing of data from permanent GPS sites during the period 2007 - 2012. Estimates of horizontal velocities of stations in Bulgaria and Northern Greece obtained by GAMIT/GLOBK along with geological an...
Conference Paper
Full-text available
On the 22 nd of May 2012, an earthquake of magnitude 5.8 occurred about 20 km SW from the capital Sofia, causing moderate damages in a wide area including the main city. According to the first reports of the seismological agencies the depth of the event was about 10km. The epicentre of the shock was in an area which was relatively silent for the la...
Article
Full-text available
We present a new kinematic and strain model of an area encompassing the Calabrian and Hellenic subduction zones, western Anatolia and the Balkans. Using Haines and Holt's (1993) method, we derive continuous velocity and strain rate fields by interpolating geodetic velocities, including recent GPS data in the Balkans. Relative motion between stable...
Article
Paracrine interactions between somatic and germ cells are critical for normal follicle development and oocyte maturation. Recent data suggest that the health and function of the granulosa and cumulus cells may be reflective of the enclosed oocytes. The aim of this study was to investigate the lysil oxidase (LOX) gene transcript levels in cumulus ce...
Article
Full-text available
Triangulation data from first order geodetic network of Bulgaria measured between 1923 and 1929 and GPS data from last two decades have been processed together. The results for horizontal velocities is about 1–3 mm/y. The strain rate in Central Western Bulgaria region is estimated. Principal axes of the horizontal strain rate are calculated from th...
Article
Definition of geodetic datums and frames implemented recently in Europe which are of particular importance for Bulgaria are presented: the European Terrestrial Reference Frame ETRF89 and the European Vertical Reference Frame EVRS. The first one is realized by the National GPS Network, whilst the second one is introduced through the merger of the Na...
Article
Full-text available
The paper discusses the comparison of the quasigeoid models EGG97 and EGG07 for the territory of Bulgaria with GPS/levelling data. The models have been compared with precise GPS and levelling measurements from National Geodetic Network with regular distribution of stations. Height anomaly differences between the models and GPS/levelling are in the...
Article
Southwestern Bulgaria belongs to the southern marginal parts of the central Balkan neotectonic region and borders the northern side of the highly seismic north Aegean region. The recent horizontal and vertical motion of the tectonic structures is controlled primarily by the collision stage, caused by continuing ENE palaeosubduction in the Ionian an...
Article
South-western (SW) Bulgaria is the most active tectonic area with moderate to high seismicity in Bulgaria. To monitor and study the tectonic deformation in this region, a Global Positioning System (GPS) network was established in early 2001. In the next years the network was extended and at present it covers the territory south from Sofia to the so...
Conference Paper
Full-text available
The initial scientific studies performed in the framework of the research project "GPS study on the active geodynamic setting of Southwest Bulgaria" are presented. The paper outlines the establishment of a geodynamic network that covers the main tectonic structures in the region of Southwest Bulgaria and gives an analysis of the seismic data for th...
Article
In the framework of the European Union SEa Level Fluctuations (SELF) I and the SELF II Projects designed to study sea level variations around the Mediterranean and Black Seas, the Global Positioning System (GPS) technique was adopted to measure the ongoing crustal movements at tide gauge stations. Tide gauges measure sea-level variations with respe...
Article
Full-text available
Two campaigns of Global Positioning System (GPS) measurements were carried out in the Concepción-Constitución area of Chile in 1996 and 1999. It is very likely that this area is a mature seismic gap, since no subduction earthquake has occurred there since 1835. In 1996, 32 sites were occupied in the range 35°S-37°S, between the Pacific coast of Chi...
Article
Full-text available
The impact of zinc incorporation on the chemical composition of electroless Ni-Zn-P coatings and the elements distribution through the thickness was studied. Ni-Zn-P alloy was deposited on various metal substrates (Al, Fe, Au) with and without electroless Ni-P underlayer. The employed bath formulation and the substrates with a Ni-P intermediate lay...
Article
Full-text available
We present and interpret Global Positioning System (GPS) measurements of crustal motions for the period 1988-1997 at 189 sites extending east-west from the Caucasus mountains to the Adriatic Sea and north-south from the southern edge of the Eurasian plate to the northern edge of the African plate. Sites on the northern Arabian platform move 18+-2 m...
Article
This paper presents a series, analogous to the f- and g-series of classical celestial mechanics, which was obtained using the potential established in the problem of two fixed centers. It is shown that random order coefficients for this series can be computed using the REDUCE-2 system for analytical transformations. The satellite orbit calculated u...
Article
An account is given of the progress made to date by the package of modeling programs employed in the 'Investigation of the Dynamics of the Euro-Asian Lithosphere (IDEAL)' project. The relative movements of the lithospheric plates for the region in question are of the order of 2-4 cm/year; the models discussed have defined the conditions for the acc...
Article
With regard to the goals of the international regional geodynamic programme IDEAL (Investigations on the Dynamics of the European-Asian Lithosphere), within the framework of the academic scientific organizations KAPG and INTERCOSMOS, a package of modelling computer programmes aimed at positioning a system of ground observatories by means of laser m...
Article
The longitude of the ascending node is substituted for the slowly converging variable omega when the inclination of the orbit is approximately 90 deg. The substitution is made in order to determine the intermediate orbit of an artificial earth satellite on the basis of the asymmetric version of the generalized problem of two motionless centers usin...
Article
Calibrated B and I-band diameter Tully-Fisher relations for edge-on spiral galaxies are derived from published data. In order to apply TF calibration for edge-on spiral galaxies, the diameters of the calibrators are corrected into edge-on view, before the TF constructions. Two versions of TF relations are compared showing the differences in the res...
Article
Full-text available
The Satellite Laser Ranging (SLR) geodetic solution for the plate motion of Carpathian-Balkan Region and the neighbourhood areas is based on the analysis of observations of the geodynamic satellites Lageos 1 (Laser GEOdynamic Satellite) covering the period April 1984 - December 2000, and Lageos 2 for the period January 1993 - December 2000. Tectoni...
Article
Full-text available
Southwestern (SW) Bulgaria is a region of the most expressed tectonic and seismic activity in the whole territory of Bulgaria. The area belongs to the zone of recent ex- tension of the earth crust with the complex interference the horizontal and vertical movements of geological structures. The tectonic activity is confirmed with the re- cent high s...
Article
Full-text available
The two major April'1928 shocks in the Plovdiv region (Central Bulgaria) are very well documented by description of the observed 105 km long surface breaks. The leveling data evaluated the classical seismic vertical changes with maximum uplift 0.53 m and maximum subsidence 1.05 m. Nowadays modern GPS data with classical triangulation observations a...
Article
The sequence of operations used in the production of Malivlies fabrics for wall coverings (web forming, stitch bonding, calendering and embossing) is specified and the problems encountered when acrylic fibres are used are outlined. Fibre and fabric properties are briefly mentioned.
Article
The stitch spacing and twist of the yarns used in the inlay and chain systems (open-end-spun 30-tex 67/33 cotton/viscose rayon inlay; 15-tex nylon filament yarn chain) are investigated in relation to the weight, air permeability and hygroscopicity of Liropol fabrics. The optimum stitch spacing is 1.3-1.5 mm, the twist is 800-940 turns/m, and the op...

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