This is a traditional field of the Department, initialized about fourty years ago by its founder - the late Dr. D. P. Zidarov. The main investigations have begun and the corresponding results are obtained mainly under his scientific leadership. Methods for solving the inverse problems of the potential fields with elementary sources (positive and negative point masses, current loops, etc.) have been worked out.
On the basis of these methods the distribution of gravity and geomagnetic inhomogeneities of a different type (local, regional and global) in the Earth can be effectively studied. The obtained solutions give an idea about the Earth's inner structure and can be used when searching and studying mineral resources. The field of the obtained sources represents a better model of these fields in the investigated region and can be used as a basis for the solution of a number of other problems from science and practice. The corresponding residual field (the difference between the observed on the Earth's surface and the field of the model) is obviously connected with the different anomalous inhomogeneities in the upper layers of the Earth and can be used in this direction.
Computer programs have been worked out and experiments, clarifying their possibilities, have been carried out.
So far these methods have been mainly used for studying the sources of these fields globally for the whole Earth and for the investigation of some local anomalies both from the territory of the country and also from different regions in the world, for example - the territory of Spain, of Antarctica, etc
Main scientist (investigaters) in this field
Name :
the late ( from 1998 ) Dr. D. P. Zidarov (the founder of this field in the department ) :Curriculum Vitae and Other Information
( in proccess of preparation ) :
Dr. Dimitar Petkov Zidarov Born - January 02, 1921, in Obzor, Pomorijsko, Bulgaria.
M. Sc. - 1947 in physics, Physical Department of Sofia University.
Ph. D. ( in physics and mathematics ) - 1968, Geophysical institute, BAS, Sophia, Bulgaria.
Scientific worker, Physical institute, BAS, 1958 - 1960 .
Sinior research worker from 1960 in the department "Geomagnetism and Gravimetry" , Geophysical Institute, BAS .
Leader of the same Department - from 1963 .
!955 - 1965 - part-time professor on "Theory of the physical fields" in the Mining and Geology University, Sofia.
Political prisoner - 1944 .
Medals - Military cross fourth degree - 1945 , Decoration - " 100 years BAS " - 1969 .
Main fields of interest : Clasical theory of potencial, theory and its applications mainly in geophysics and geodesy .
Name :
Dr. Zheljo P. Zhelev :Curriculum Vitae and Other Information
Dr. Zhelev P.
Zheljo Profession, Duties :Senior
Research Worker Affiliation :Department of
Geomagnetism and Gravimetry, Geophysical Institute, BULGARIAN
ACADEMY OF SCIENCES ( B A S ) , Sofia, B U L G A R I AMailing
Address
:
Dr. Zheljo Zhelev (or Jeljo Jelev) ,
Geophysical institute of BAS
“Akad. G. Bonchev “ str., block 3
room 213 ., Sofia 1113, BULGARIA Telephone and Fax :
tel. (003592) 971 3177 Fax (003592) 971 3005E-mails : jelev@geophys.bas.bg
Born August 07, 1938, Bulgaria, M. Sc. 1965, in geophysics, Geophysical Department of Higher Institute of Mining and Geology, Sofia, Bulgaria; Ph.D. ( in physics and mathematics ) 1970, Geophysical Institute, Bulgarian Academy of Sciences, Sofia, Bulgaria; Associate Professor in mathematical methods in gravimetry and geomagnetism, 1986, Geophysical Institute, Bulgarian Academy of Sciences, Sofia, Bulgaria; Deputee Director and secretary scientific of the Geophysical Institute, BAS, Sofia, 1998 - 2002, Leader of the Department of "Geomagnetism and Gravimetry" of the Geophysical Institute of BAS, Sofia, 2000 - 2004 , Visiting Scientist (four months) 1973, University of California, Berkeley, USA , Member of the Specialized Scientific Council of Geophysics, 1998 - , Member of the Scientific Council of the Geophysical Institute of BAS, 1996 - , Member of the Panetary Society of America, 1996 - 2000, Member of the Bulgarian Society of physics , 1994 - , Member of the Bulgarian Geophysical Society, 1994 - .
Main fields of interest : inverse problems of potential fields, methods and algorithms for their solution, corresponding computer programs and applications for processing of real geophysical data, stability and uniqueness of the solution, transformations and filtrations of potential field data, inverse spectral problems (time - series analysis) - theory and applications.
Main topics of recent research : inverse problems - theory and applications, methods for optimization of multi parameter non linear functions and for obtaining equi family bodies ( bodies with identical external fields ) , partial balayage (bubbling) and concentration - applications for the solution of the inverse problems, modelling of local and global gravity and magnetic observations, analysis of potential fields in frequency domain, inverse spectral problem - applications for analysis of real geophysical data.
Name : Dr. Totka D. Petrova
Curriculum Vitae and other information
Profession, Duties :
Senior Research Worker
Affiliation :
Department of Geomagnetism and Gravimetry, Geophysical Institute, BULGARIAN ACADEMY OF SCIENCES ( B A S ) , Sofia, B U L G A R I A
Mailing Address :
Dr. Totka Petrova ,
Geophysical institute of BAS
“Akad. G. Bonchev “ str., block 3
room 213 ., Sofia 1113, BULGARIA
Telephone and Fax :
tel. (003592) 979 3342 Fax (003592) 971 3005
E-mails : petrova@geophys.bas.bg
Born July 11, 1945, Bulgaria; M.Sc. 1969, Department of Physics, Sofia University; Research Fellow 1977; Ph. D. (in physics) 1986, Geophysical Institute, Bulgarian Academy of Sciences, Sofia. Main fields of interest: inverse magnetic problem , inverse spectral problem, applications for the analysis of geophysical data.
Main topics of recent research : models of the global earth magnetic field, inverse spectral problem (time-series analysis of real geophysical observations) - processing of magnetic and cheomagnetic data.
Doktorant - Petyia Trifonova Rusinova :
 |
Petya Trifonova-Rusinova Ph.D Student
Supervisor : Dr. Zh. Zhelev , Consultant : Dr. T. Petrova |
Phone:
(+359 888) 218 948; (+359 2) 971 3177E-mail:
p.trifonova@abv.bg
Brief CV
Qualification M.Sc. -
Applied Geophysics, 1993/1998University of Mining and Geology “St. Ivan Rilsky”, Sofia;
M.Sc Thesis : “Complex analysis and interpretation of geophysical data in the Northern Bulgarian shelf and adjoining deep-water zone of the Black Sea”
Postgraduate Specialization - 2001/2002
University of Mining and Geology “St. Ivan Rilsky”, Sofia;
Dissertation :
“Project for Complex Geological and Geophysical Investigation in the North-eastern Part of the Bulgarian Black Sea’s Shelf”PhD student – 2003/now
Department of Geomagnetism and Gravimetry, Geophysical Institute of the BAS, Sofia;
Dissertation :
”Determination of the Bottom of the Magnetic Earth’s Crust Layer of the Bulgarian Territory on the Basis of Geomagnetic Measurements”International Projects :
2004 - Two months project within the Young Scientists Fellowship Program of the Center of Excellence on Geophysical Methods and Observations for Sustainable Development (GEODEV) of the Geophysical Institute of the Polish Academy of Sciences. Supervisor: Dr. St. Wybraniec, Polish Geological Institute, Warsaw.
Topic of the research : “Determination of the Curie point depths on the basis of geomagnetic measurements- comparison of the results for Bulgarian/Romanian territory and NW part of Poland”
2004-2005
- Eight months project within the Marie Curie Training Site Program in the Geology Department, Royal Holloway University of London. Supervisors: Prof. C. Ebinger, Prof. K. McClay.Topic of the research project : “Upper crustal structure of the Otway Basin and its implication to the continental breakup”
Area of interest :
Inverse problems for gravity and magnetic data; spectral analysis in geophysics; complex interpretation of seismic, gravity and magnetics for tectonic reconstruction.
L I S T O F S E L E C T E D P U B L I C A T I O N S
1. Zidarov, D. P., 1965 . Solution of Some Inverse Problems of Applied Geophysics . Geophysical Prospecting, 13, 2 , 240 – 246 .
2. Zidarov, D. P., 1968 . On the Solution of Some Inverse Problems of the Potential Fields and its Application in the Exploration Geophysics . B A S , Sofia .
3. Zidarov, D., T. Petrova, \ K.Petrov, On the analysis of paleo-magnetic data, Compt. rend. Acad. bulg. Sci., t 22, N 6, 659-662, 1969,
4. Zhelev, Zheljo (Zh.) , Application of the Poincare's Method of Bubling (Balayage ) for Solution of the Inverse Pot ential Field Problems, Doctor (candidate) of science thesis, archive GFI , B A S , Sofia, 1970 .
5. Zidarov, D., Zh. Zhelev, On obtaining a family of bodies with identical external field - method of bubbling, Geoph. Prospecting, 18 (1970), N 1, 13 - 33 .
6. Zhelev, Zh., One Numerical Solution of the Inverse Gravity Problem with Application of the Method of Balaqyage, Bull. Geophys. inst., B A S , 18, 1972, 143 - 156 .
7. Zidarov D., T.Petrova, Representation of the Earth`s magnetic field as a field of a circular circuit, IAGA, Bulletin N 34, Program and Abstracts for the second general cientific
assembly, Japan, 89, 1973 .
8. Zhelev, Zh., Some Numerical Results of the Inverse Gravity Problem Solution with a Finite Number of Elementary Sources, Compt. rend. Acad. bulg. Sci., 27, 1974, 6, 791 - 794.
9. Zhelev, Zh., New Algorithm for Obtaining a Family of Bodies with Identical External Gravity Fields, Compt. rend. Acad. Bulg. Sci., 29, 1976, 3, 339 - 342 .
10. Zhelev, Zh., Some Comparative Results from the Solution of the Inverse Gravity Problem with a Point Sources Model, Bulg. Geophys, J., 2, 1976, 1, 61 - 72 .
11. Zhelev, Zh., On Modelling Potential Fields with Mobile Elementary Sources, Compt. rend. Acad. bulg. Sci., 29, 1976, 7, 983 - 986 .
12. Zidarov D., T.Petrova, An improved sweeping out-bubbling method for obtained gravitational equivalent bodies, Compt. rend. Acad. bulg. Sci., 29, 1976 ,2\7 , 1185-188 .
13. Zhelev, Zh., An Application of the Method of Grids for Increasig the Acuracy in Obtaining Equifamily Gravity Bodies, Compt. rend. Acad. bulg. Sci., 30, 1977, 5, 679 - 682 .
14. Zidarov D., T.Petrova, Representation of the Earth`s magnetic as a field of a circuit current loop, Gerlands Beitr. Geophysics, Leipzig 6, 1978, 469-475.
15. Zidarov D., T.Petrova, Representation of the Earth`s magnetic field as a field of ircular electric current loops (three, five), Compt. rend. Acad. bulg. Sci., t 31, 1978 , 6, 663-666 .
16. Zidarov, D. , T. Petrova, Presenting of the Earth's Magnetic Field as a Field of Circular Electric Curent Loops (two, four), Compt. rend. Acad. bulg. Sci., 32, 1979, 1.
17. Zhelev, Zh., Method for Global Solution of the Inverse Isostatic Problem by Gravity Observations, Bulg. Geophys. J., 6 , 1980, 2, 86 - 96 .
18. Zhelev, Zh., Method for Determination of Earth's Crust Power by Gravity and Seismic Observations, Compt. rend. Acad. bulg. Sci., 34, 1981, 1, 31 - 34 .
19. Zidarov D., T. Petrova, Representation of the Earth`s Contemporary and aleomagnetic as the field of circular loop. Magnetic field and the Processes in the Earth's interior, Academia, Prague, 1983, 259-267.
20. Zidarov D., T.Petrova, Short-term prediction of the main terres-A trial magnetic Field, Compt. rend. Acad. bulg 7. Sci., t 36, 1, 8, 1055-1058, 1983 .
21. Zhelev, Zh., H. M. Georgiev, Some Preliminary Results of the Representation of the Earth's Gravity Field as a Model of Elementary Sources, Compt. rend. Acad. bulg. Sci., 38, 1985, 3, 315 - 317 .
22. Zhelev, Zh., A Method for Obtaining the Elementary Sources of Potential Fields in Frequancy Domain, Compt. rend. Acad. bulg. Sci., 38, 1985, 11.
23. Zhelev, Zh. P., Some Results from the Representation of the World Gravity Anomalies with Elementary Sources, report presented on the 8-th Mathematical Geophysics Int. Seminar, Berlin, 1990, In : Model Optimization in Geophysics ( Ed. A. Vogel ).
24. Zhelev, Zh., Hr. M. Georgiev, Some Preliminary Results of the Representation of the Earth's Gravity Field as a Model of Elementary Sources, Compt. rend. Acad. bulg. Sci., 38, 1985, 3, 315 - 317
25. Zhelev, Zh., On the Solution of the Inverse Problem for the Gravity Geoid, Bulg. Geophys. J., 11, 1985, 4, 132 - 140.
26. Petrova T.D., A.P.Anufriev, Concentration of electric currents on the boundary between inner and outer core, Compt. Rend. Acad. Bulg. Sci. 39, 6, 43-45, 1986 .
27. Zidarow D., T. Petrowa, Approksimaci˙ paleomagnitnoăo polia, polem optimalúnoăo ektrichĺskovo kontura, Seminar Mat. metody reřeni˙ obratnčő zada÷ geofizi1eskiő poleé, olenice, 1986, 117-122, Bratislawa, 1986 .
28. Anufriew A.P., T.D.Petrowa, On the question of the distribution of the electrical current in the Earth's core. Bulg. Geoph. Jour. 12 ,1986 , 6 .
29. Anufriew A. P., T. D. Petrowa, Geomagnetic variations on archeomagnetic data - review. Conference on Geomagnetism in Panagiurishte, 1987.
30. Anufriew A.P., T.D.Petrowa, Statisticheskie svojstva arheomaănitniő vremennčih riadov na territorii Bolgarii, BGS, 14\7, 4, 499-506 ,1988,
31. Anufriev A.P., T.D.Petrova, Secular variations based on Archeo-magnetic data from Ukraine and Bulgaria, Proceedings of the 7th International Mathematical Geophysics Seminar helt at the Free University of West Berlin, Feb. 18-11, 1989
32. Zhelev, Zh., On the nted on the 7-th Mathematical Geophysics Int. Seminar, 1989, In Model Optimization in Geophysics (Ed. A. Vogel).
33. Petrova, T. D. , Secular variation on the base of archeomagnetic data from Poland and Italy, Bulgarian Geoph. Jour. No. 3, 1990 .
34. Zhelev, Zh., T. Petrova, On the Solution of the Inverse Spectral Problem through Optimization, (Report presented on the 8-th Seminar on Mathematical Geophysical Int. Seminar, 1990, Free University, Berlin ), In : Model optimization in Exploration Geophysics ( Ed. A. Vogel ).
35. Zhelev, Zh., T. Petrova, Errors in the Solution of the Inverse Spectral Problem through Optimization, Report presented at the International Symposium on Inverse Problems for Potential fields and applications in Geophysics, October 8 -13, 1990, Sofia, Bulgaria.
36. Zhelev, Zh. P., On the Precision of the Method of Grids and The Partial Balayllage ( Sweeping out ) , Bulgarian Geophysical Journal, v. 18, 3, 1992, p. 43 - 51 .
37. Zhelev, Zh. P., T. Petrova, On the Solution of the Inverse Spectral Problem, Bulgarian Geophysical Journal, v. 18, 4, 1992, p. 78 - 89 .
38. Zhelev, Zh. P., T. Petrova, Solution of the Inverse Magnetic Problem with a System of Final Dipoles, Bulgarian Geophysical Journal, v. 18, 3, 1992, p. 43 - 53 .
39. Zhelev, Zh. P., T. Petrova, Some Results from the Representation of Several Magnetic Anomalies from South Bulgaria with Final Dipoles, Bulgarian Geophysical Journal, v. 18, 3, 1993, p. 61 - 71 .
40. Zhelev, Zh. P., T. Petrova, Some Theoretical Experiments from the Solution of the Inverse Magnetic Problem with Final Dipoles, Proceedings of the 2nd Congress of the Hellenic Geophysical Union, Florina, 5-7 may, 1993 , Macedonia, Greece, p. 85 - 95 .
41. Zhelev, Zh. P., T. Petrova, Some Results from the Representation of Several Magnetic Anomalies from South Bulgaria with Final Dipoles, Proceedings of the 2nd Congress of the Hellenic Geophysical Union, Florina, 5-7 may, 1993 , Macedonia, Greece , p. 96 - 106 .
42. Zhelev, Zh. P., On the Representation of the World Gravity Anomalies Sources with a Final Number of Point Masses, Bulgarian Geophysical Journal, v. 20, 2, 1994, p. 57 - 67 .
43. Zhelev, Zh. P., T. Petrova, On the Solution of the Inverse Magnetic Problem with a System of Positive and Negative Point Sources, Bulgarian Geophysical Journal, v. 20, 4, 1994, p. 48 - 57 .
44. Petrova, T., Review on the results of the solution of the Inverse Magnetic problems. Prediction of the Earth Magnetic field, BGS,kn.1, 1995
45. Zhelev, Zh. P., Hr. M. Georgiev, Upward and Downward Analytical Continuation of the Earth Magnetic Field in Bulgaria, Bulgarian Geophysical Journal, v. 21, 4, 1995, p. 41 - 48 .
46. Zhelev, Zh. P., T. Petrova, R. Vieira, F. Gonzalez, Some Results of the Analysis of the Lozoyuela Gravity Anomaly with Elementary Sources, Bulgarian Geophysical Journal, 22, 1996, 3, 51 - 62 .
47. Zhelev, Zh. P. , Hr. M. Georgiev, On the Analytical Continuation of the Potential Fields, Bulgarian Geophysical Journal, v. 23, 1, 1997, p. ... - ... .
48. Zhelev, Zh. P., T. Petrova, Some New Experiments on the Solution of the Inverse Magnetic Problem with Positive and Negative Elementary Sources, Bulgarian Geophysical Journal, v. 24, 1-2, Sofia, 1998, p. 144 - 164 .
49. Zhelev, Zh. P., T. Petrova, Some Results from the Representation of Several Magnetic Anomalies of the Territory of South Bulgaria with Positive and Negative Elementary Sources, Bulgarian Geophysical Journal, v. 24, 3-4, 1998, p. ... - ... .
50. Zhelev, Zh., T. Petrova, Inverse Magnetic Problem with Positive and Negative Elementary Sources, Bulgarian Geophysical Journal, vol. 24, 1998, 1 - 2 , p. 144 - 163 .
51. Zhelev, Zh., T. Petrova, Some Results from rhe Representation of Several Magnetic Anomalies of the Territory of South Bulgaria with Positive band Negative Elementary Sources, Bulgarian Geophysical Journal, vol. 24, 1998, 3 - 4 , p. 83 - 99 .
52. Zhelev, Zh., T. Petrova, F. Montesinos, R. Vieira, J.Arnoso, A. Camacho, Some New Results of the Analysis of the Lanzarote ( Canary Islands ) , Gravity Anomaly with Elementary Sources, Bulgarian Geophysical Journal, vol. 28, 2 002, 1 - 4 , p. 91 - 106 .
53. Zhelev, Zh., T. Petrova, F. Montesinos, R. Vieira, J.Arnoso, A. Camacho, Some Preliminary Results of the Analysis of the Lanzarote ( Canary Islands ) Gravity Anomaly with Elementary Sources, Report ( paper ) presented at the JUBILEE INTERNATIONAL SCIENTIFIC SESSION - 50 years University of Mining and Geology " St. Ivan Rilski ", 14 -16 May, 2003, Sofia, Bulgaria, In : Annual of the University of Mining and Geology - "St. Ivan Rilski", Part I : Geology and Geophysics, Sofia, 2 003 , at english - 8 pages and at Bulgarian - 8 pages.
54. Zhelev, Zh., T. Petrova, F. Montesinos, R. Vieira, A. Camacho, Some Preliminary Results of the Analysis of the Alcala de Ebro Village ( Zaragoza, Spain ) Gravity Anomaly with a Set of Point Sources, Report ( paper ) presented at the JUBILEE INTERNATIONAL SCIENTIFIC SESSION - 50 years University of Mining and Geology "St. Ivan Rilski", 14 -16 May, 2003, Sofia, Bulgaria, In : Annual of the University of Mining and Geology - "St. Ivan Rilski", Part I : Geology and Geophysics, Sofia, 2 003 , at english - 8 pages and at Bulgarian - 8 pages.
OTHER SCIENTIFIC ACTIVITIES ( without the very significant scientific activity of the late D-r D. P. Zidarov ) :
PARTISIPATION IN INTERNATIONAL PROJECTS :
One joint project with Spain on the following subject : " Numerical analysis of geophysical data ( gravity, magnetic, seismic and okeanographic ) in time and space domain with the Aim of Investigation the inner structure of the Earth and dangerous natural events and processes ( volcanoes, earthquakes, etc. ) " .
GUIDANCE OF POST GRADUATES :
One post graduate on the following subject : "Curie Point Depth of Bulgaria on the basis of geomagnetic ibservations" , 2 003 - 2 005 .
CITATIONS :
About 110 noticed citations ( 20 of them in monographs, textbooks and manuals ) , 50 in foreign editions and the rest - 60 in bulgarian ones, about 65 one-man and the rest - 45 with co-authors.