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4th Congress of the Balkan Geophysical Society
- Conference date: 09 Oct 2005 - 12 Oct 2005
- Location: Bucharest, Romania
- Published: 09 October 2005
1 - 20 of 198 results
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Earthquake Seismology, Exploration Seismology and Engineering Seismology: How Sweet It is --- Listening to the Earth
By O. YilmazKN - 01 KEYNOTE ADDRESS Earthquake Seismology Exploration Seismology and Engineering Seismology: How Sweet It is --- Listening to the Earth Oz Yilmaz GeoTomo LLC SUA Summary The seismic method has three applications with different requirements for band-width and depth-width: (1) Earthquake seismology with a bandwidth up to 10 Hz and a depth of interest down to 100 km (2) Exploration seismology with a bandwidth up to 100 Hz and a depth of interest down to 10 km and (3) Engineering seismology with a bandwidth up to 1000 Hz and a depth of interest down to 1 km. Each of
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Prestack Scalar Reverse-Time Depth Migration of Three-Dimensional Elastic Seismic Data
Authors R. Sun, G. A. McMechan and C-S. LeeO1 - 01 SEISMIC ACQUISITION & PROCESSING Prestack Scalar Reverse-Time Depth Migration of Three- Dimensional Elastic Seismic Data Robert Sun 1 2 George A. McMechan 2 Chen-Shao Lee 1 1 Department of Earth Sciences National Chengkung University 1 Tahsueh Rd. Tainan Taiwan 701 2 Center for Lithospheric Studies University of Texas at Dallas Richardson Texas 75083 USA Summary We migrate the reflected P- and S-waves in a prestack threedimensional (3-D) three-component (3-C) elastic seismic data volume generated with a P-wave source in a three-dimensional model using two independent 3-D scalar reverse-time depth migrations. P- and P-S-converted waves are extracted by
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Time-Shift Wave-Equation Imaging
More LessO1 - 02 SEISMIC ACQUISITION & PROCESSING TIME-SHIFT WAVE-EQUATION IMAGING Paul Sava Sergey Fomel Bureau of Economic Geology The University of Texas at Austin Austin TX 78758 USA Summary We derive a new generalized imaging condition based on time shifts between source and receiver wavefields. This imaging condition contrasts with other imaging techniques requiring space shifts between the two wavefields. This imaging condition is applicable to both Kirchhoff and wave-equation migrations. The transformation allows us to generate common-image gathers presented as function of either time-shift or pseudo-angle at every location in space. Inaccurate migration velocity is revealed by common-image gathers
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A Grid-Enabled System for 3-D Seismic Imaging
Authors D. Bevc, I. Musat, M. Popovici and S. E. ZarantonelloO1 - 03 SEISMIC ACQUISITION & PROCESSING A GRID-ENABLED SYSTEM FOR 3-D SEISMIC IMAGING Dimitri Bevc Iulian Musat Mihai Popovici Sergio E. Zarantonello 3DGeo Development Inc. Suite 401 4633 Old Ironsides Drive Santa Clara CA 95054 USA Summary One way to meet the increasing computational demands of the seismic imaging industry is by seamlessly enabling access to compute on demand capability. Grid computing by leveraging the Globus Toolkit (Foster & Kesselman 1997) middleware provides a framework where remote computational resources can be accessed whenever and wherever needed. The objective of this paper is to give an overview of a Grid-enabled
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A Pragmatic View of Land Multiple Attenuation Technology
More LessO1 - 04 SEISMIC ACQUISITION & PROCESSING A PRAGMATIC VIEW OF LAND MULTIPLE ATTENUATION TECHNOLOGY Panos G. Kelamis Saudi Aramco Panos G. Kelamis obtained a B.Sc. (Hon.) in Physics from the University of Athens Greece (1977) a M.Sc. and D.I.C. in Geophysics from the Imperial College of the University of London (1978) and a Ph.D. in Geophysics from the University of Alberta (1982). He worked with the Research & Development group of Western Geophysical in Houston and for Dome Petroleum in Calgary before joining Saudi Aramco in Dhahran. Within Saudi Aramco Panos held various technical and supervisory positions in Geophysical
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Faults Mapping Using Electrical Resistivity Tomography (E.R.T.)
Authors I. Oancea and A. PetrescuELECTRICAL ELECTROMAGNETICS & GPR O10 - 01 FAULTS MAPPING USING ELECTRICAL RESISTIVITY TOMOGRAPHY (E.R.T.) Introduction I. Oancea A. Petrescu INCDMRR Bucharest Romania Faults and fractures are generally speaking undesired elements in mining exploitation activity constituing the main access path for mining water. On the other hand crossing faults with mining workings is always very difficult and dangerous. There are situations when presents of faults are benefically; the case of uranium ore bodies when uraniferous mineralization is locate specially over the fractures. With this reason in mind we consider very important to posses a fast and cheap methodology to help in
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Hybrid Genetic Algorithms Derived from the Evolution Theories
Authors A. T. Basokur and I. AkcaELECTRICAL ELECTROMAGNETICS & GPR O10 - 02 HYBRID GENETIC ALGORITHMS DERIVED FROM THE EVOLUTION THEORIES Introduction Ahmet T. Basokur Irfan Akca Ankara University Turkey The derivative based inversion methods find considerable amount of applications in geophysical problems but they suffer from converging to nearest local minimum in the neighbourhood of initial guess. On the other hand the genetic algorithm that simulates biological processes could explore a wider region of parameter space. Although the algorithm may track the global minimum that corresponds to the solution they could not be used for accurate localisation. In other words the classical genetic algorithm is
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2-D Lamarckian Inversion of Resistivity Data
Authors I. Ahmet and T. BasokurELECTRICAL ELECTROMAGNETICS & GPR O10 - 03 2-D LAMARCKIAN INVERSION OF RESISTIVITY DATA Introduction Irfan Akca Ahmet T. Basokur Ankara University Turkey The purpose of the inversion algorithms is to derive the subsurface distribution of a certain type physical parameter that causes the variation of applied geophysical fields. The inversion of geophysical data is carried out by updating an initial guess supplied by the interpreter in an iterative manner. The most of inversion algorithms are based on the estimation of a new set of parameters that provides less misfit error than that of the previous iteration. The parameter change vector
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DC Resistivity Map of Hungary, based on the National Geoelectric Database
More LessELECTRICAL ELECTROMAGNETICS & GPR O10 - 04 DC RESISTIVITY MAP OF HUNGARY BASED ON THE NATIONAL GEOELECTRIC DATABASE Lazlo Sores Janos Kiss Eötvös Loránd Geophysical Institute of Hungary ( ELGI ) H-1440 Budapest Hungary Summary The National Geoelectric Database of Hungary is an expanding collection of DC and TDEM soundings. Due to a state sponsored archiving project from 1998 to 2005 4000 TDEM soundings and more than 33000 DC soundings were digitized and uploaded into the database. This data set includes most TDEM and DC data ever collected by the Lorand Eötvös Geophysical Institute (ELGI). Over 5000 soundings that was
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Resistivity Arrays in the Detection of Buried Bodies
Authors G. Apostolopoulos, C. Orfanos, G. Amolochitis, K. Leontarakis and S. StamatakiELECTRICAL ELECTROMAGNETICS & GPR O10 - 05 RESISTIVITY ARRAYS IN THE DETECTION OF BURIED BODIES G. Apostolopoulos C. Orfanos G. Amolochitis K. Leontarakis S. Stamataki National Technical University of Athens School of Mining and Metallurgy Athens Greece Introduction The resistivity method has a wide range of applications (hydrogeological environmental and geotechnical). Recently the use of multi-electrode systems gave the chance for many and easy field measurements. These measurements with resistivity tomography interpretation approach have given models of the underground with fine definition of sedimentation or exact positioning of isolated bodies. The electrode arrays used have their own advantages and disadvantages
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GPR in a Single Borehole for Determining Complex Geological Structures
Authors D. Eisenburger and V. GundelachELECTRICAL ELECTROMAGNETICS & GPR O10 - 06 GPR IN A SINGLE BOREHOLE FOR DETERMINING COMPLEX GEOLOGICAL STRUCTURES D. Eisenburger V. Gundelach Federal Institute for Geosciences and Natural Resources Hannover Germany Introduction There is a need to deposit dangerous materials safely in underground repositories. Because technical barriers only provide a limited degree of security it is important to find natural geological barriers which are effective and safe in the long term. GPR surveys from boreholes can be conducted to investigate suitable host rocks e.g. salt in this case. Method used GPR borehole logs are carried out in boreholes drilled underground as
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2D Modeling on the Base of Subsurface Gravity Measurements
More LessO11 - 01 GRAVITY MAGNETICS & GEOMAGNETISM 2D MODELING ON THE BASE OF SUBSURFACE GRAVITY MEASUREMENTS Ivana Vasiljevic University of Belgrade Serbia and Montenegro Summary A simple method for 2D gravity modeling on the base of surface and subsurface gravity measurements is presented. Interval densities calculated from gravity measurements on different levels are used to create a model. Method can be applied wherever gravity measurements are conducted along parallel profiles on different levels but it is especially suitable for deep mines. Method is designed for solving density distribution problem in cases of significant lateral density variations above and below mine
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Evaluation of Different Receiver Orientations and Receiver Separations in Magnetic Gradiometer Method
Authors M. Özgü Arisoy and Emin U. UlugererliO11 - 02 GRAVITY MAGNETICS & GEOMAGNETISM EVALUATION OF DIFFERENT RECEIVER ORIENTATIONS AND RECEIVER SEPARATIONS IN MAGNETIC GRADIOMETER METHOD M. Özgü Arisoy 1 Emin U. Ulugererli 2 1 Cumhuriyet University Faculty of Engineering Department of Geophysical Engineering 58140 Sivas Turkey 2 Ankara University Faculty of Engineering Department of Geophysical Engineering 06100 Tandogan – Ankara Turkey Summary Different receiver orientations and receiver separation have been considered for the magnetic gradiometer survey used for the exploration of shallow underground structures. Appropriate receiver orientation and the choice of receiver separation helped to delineate the boundary of subsurface structures. Horizontal (in both x and
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Interpretation of Potential Field Data Based on the Field and Enhanced Magnitude
By Arben LuloO11 - 03 GRAVITY MAGNETICS & GEOMAGNETISM INTERPRETATION OF POTENTIAL FIELD DATA BASED ON THE FIELD AND ENHANCED MAGNITUDE Arben Lulo Geophysical Consulting Albania Summary It is presented here an approach for interpretation of profile magnetic data through magnitude of potential field/derivative anomaly of geological structures approximated by simple geometries. This method gets start from the Euler equation the extended Euler equations to produce linear equations as a function of the model parameters. The equation can be solved to determine the horizontal location depth and structural index of a 2D magnetic simple source. That method is based on space relationship
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Non-Tidal Gravity Changes Across Major Lithosphere Boundaries on the Romanian Territory
Authors L. Besutiu, L. Zlagnean and M. HoromneaO11 - 04 GRAVITY MAGNETICS & GEOMAGNETISM NON-TIDAL GRAVITY CHANGES ACROSS MAJOR LITHOSPHERE BOUNDARIES ON THE ROMANIAN TERRITORY L. Besutiu L. Zlagnean M. Horomnea Institute of Geodynamics of the Romanian Academy Bucharest Romania The Romanian geodynamic network Plate boundaries on the Romanian territory and their dynamics have been recently reviewed (Besutiu 2003; Besutiu et al. 2004) with special emphasize on the role played by the Black Sea opening (Besutiu Zugravescu 2003). Short-distance large variations in the lithosphere thickness advocate for the presence of at least three tectonic plates / sub-plates in the area. East European plate (EEP) with a lithosphere
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The Secular Variation of the Geomagnetic Field in Romania in the Time Interval 1980-2004
Authors C. Demetrescu, M. Ene and V. DobricaO11 - 05 GRAVITY MAGNETICS & GEOMAGNETISM THE SECULAR VARIATION OF THE GEOMAGNETIC FIELD IN ROMANIA IN THE TIME INTERVAL 1980-2004 C. Demetrescu M. Ene V. Dobrica Institute of Geodynamics Bucharest Romania Summary Geomagnetic data obtained by QHM and proton magnetometer measurements taken in the time interval 1980-2004 in the 26 stations of the Romanian repeat station network have been processed to obtain a complex and detailed model of the lateral and temporal evolution of the horizontal component of the main geomagnetic field and its secular variation. The interpretation of data from which the sunspot cycle contribution is removed in
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Variability Of The Temperature-Dependent Susceptibility Of Loess-Paleosol Deposits From Romania
Authors C. Panaiotu, V. Hoffmann, C. E. Panaiotu and C. NeculaO12 - 01 GLOBAL CHANGES & MARINE GEOSCIENCES VARIABILITY OF THE TEMPERATURE-DEPENDENT SUSCEPTIBILITY OF LOESS-PALEOSOL DEPOSITS FROM ROMANIA 1 2 1 1 C. Panaiotu V. Hoffmann C. E. Panaiotu C. Necula 1 University of Bucharest Paleomagnetic Laboratory Bucharest Romania 2 Institut fur Geologie und Palaontologie Arbeitsbereich Geophysik Universitat Tubingen Germany Summary An investigation of the temperature-dependent susceptibility was conducted on several samples selected from 4 Quaternary loess-paleosol deposits on a East – West transect starting on the Black Sea shore and ending near the Olt Valley. The specimens were selected from recent soils chernozemic paleosols brown forest paleosols and two
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Ground Surface Temperature Variations In The Last 200 Years In Romania, From Inversion Of Borehole Temperature Data
Authors C. Demetrescu, M. Tumanian, V. Dobrica and C. BoroneantO12 - 02 GLOBAL CHANGES & MARINE GEOSCIENCES GROUND SURFACE TEMPERATURE VARIATIONS IN THE LAST 200 YEARS IN ROMANIA FROM INVERSION OF BOREHOLE TEMPERATURE DATA C. Demetrescu 1 M. Tumanian 1 V. Dobrica 1 C. Boroneant 2 1 Institute of Geodynamics Bucharest Romania 2 National Administration for Meteorology Bucharest Romania Summary Temperature data from eight boreholes in the orogen bordering the Transylvanian Basin (Eastern Carpathians Apuseni Mts.) have been inverted for ground surface temperature history (GSTH) in the last 200 years. The temperature measurements were obtained with a thermistor probe (sensitivity in the 0.01 K range) using the stop and
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Interaction Of Petroleum Deposits To Atmosphere In Formation Of Tornadoes
By S. MoriGLOBAL CHANGES & MARINE GEOSCIENCES O12 - 03 INTERACTION OF PETROLEUM DEPOSITS TO ATMOSPHERE IN FORMATION OF TORNADOES Shuji Mori 3755 Mountview Rd. Columbus OH 43220 USA Summary Specific geophysical features such as oil and gas deposits may interact atmospheric environment. A deposit of petroleum or oil and gas seems to induce localized severe meteorological phenomena such as tornado upon a thunderstorm front passage over the deposits. Probability and statistic massive data reduction are demonstrated by employing continental U.S. proven oil and gas deposit distribution provided by DOE 1 and >40000 tornado occurrence recorded by NOAA 2 over decades to
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Harvesting The Gas Hydrates In The Black Sea: Technology And Economics
Authors C. Cranganu and B. NitzovGLOBAL CHANGES & MARINE GEOSCIENCES O12 - 04 HARVESTING THE GAS HYDRATES IN THE BLACK SEA: TECHNOLOGY AND ECONOMICS Summary Constantin Cranganu 1 Boyko Nitzov 2 1 The City Univrsity of New York Brooklyn College USA 2 University of Oklahoma USA Gas hydrates (clathrates) have been known for 200+ years; for over 60 years they have been studied by the oil and gas industry. Recently a flood of publications has covered in great detail many of the branches of the gas hydrates “knowledge tree”. Suffice to point out that just the Annals of the New York Academy of Sciences since
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