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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 - 50 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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Multibeam Backscatter Seabed Classification
Authors X. Monteys and D. InamdarGLOBAL CHANGES & MARINE GEOSCIENCES O12 - 05 MULTIBEAM BACKSCATTER SEABED CLASSIFICATION X. Monteys D. Inamdar Geologic Survey of Ireland Dublin Ireland The Irish National Seabed Survey is now into its sixth and final year of acquisition programme. The Irish continental shelf deeper than 200 meters was completed in 2002 and since then the survey operations have concentrated in coastal areas Zone 2 water depths ranging from 0 to 200m utilizing the R.V Celtic Explorer. Paper charts to 1:60 000 scale from the Malin Sea north-west of Ireland together with a GIS database have been produced to serve as a
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Altimeter Range Determination And Applications Using A Transponder
Authors E. Cristea, W. Hausleitner and P. PesecGLOBAL CHANGES & MARINE GEOSCIENCES O12 - 06 ALTIMETER RANGE DETERMINATION AND APPLICATIONS USING A TRANSPONDER Summary E. Cristea; W. Hausleitner; P. Pesec Space Research Institute Austrian Academy of Sciences Graz Austria Satellite altimetry provides a precise measure of the vertical distance of the satellite borne altimeter to the instantaneous sea surface. The accuracy of this distance depends on the calibration of the altimeter the quality of the reflecting target and the proper estimate of path delay. The general design characteristics for absolute altimeter calibration implies a large number of measurements to reduce the random errors diversity of measurement techniques
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Satellite Remote Sensing And Gps Data For Seismic Hazard Analysis In Vrancea Area
Authors M. Zorana and D. MateciucREMOTE SENSING & SATELLITE IMAGERY O13 - 01 SATELLITE REMOTE SENSING AND GPS DATA FOR SEISMIC HAZARD ANALYSIS IN VRANCEA AREA Summary Maria Zorana 1 Doru Mateciuc 2 1 National Institute of R&D for Optoelectronics Remote Sensing Dept. MG5 Bucharest-Magurele Romania 2 National Institute of Earth Physics Bucharest-Magurele Romania The seismic hazard of Romania is relatively high mainly due to the subcrustal earthquakes located at the sharp bend of the Southeast Carpathians in Vrancea region one of the most seismically active area in Europe. Vrancea area is assumed to be a conjunction of 4 tectonic blocks which lie on the
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Recognition Of Iron-Containing Ore Minerals And Rocks Using Remotely Sensed Data
Authors D. Borisova, H. Nikolov, M. Danov and R. KanchevaREMOTE SENSING & SATELLITE IMAGERY O13 - 02 RECOGNITION OF IRON-CONTAINING ORE MINERALS AND ROCKS USING REMOTELY SENSED DATA D.Borisova H.Nikolov M.Danov R.Kancheva Solar-Terrestrial Influences Laboratory – Bulgarian Academy of Sciences Sofia Bulgaria Summary Abstract Recognition of iron-containing ore minerals and rocks using remotely sensed data is a special case. Spectral mixture analysis has as one of the basic objective the definition of subpixel (subclass) proportions of spectral endmembers (classes) which are related to mappable surface constituents. Spectral mixture analysis decomposes the mixed pixel determining the fractions of each spectral endmember which combine to produce the mixed pixel's spectral signature.
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Tectonic Alignments Analysis In Oas-Gutai Mts. Area (Nw Romania) By Remote Sensing And Geophysical Methods
Authors D. Dordea, V. Sprinceana and A. DobrescuProspectiuni S.A.O13 - 03 REMOTE SENSING & SATELLITE IMAGERY TECTONIC ALIGNMENTS ANALYSIS IN OAS-GUTAI MTS. AREA (NW ROMANIA) BY REMOTE SENSING AND GEOPHYSICAL METHODS D. Dordea 1 V. Sprinceană 1 A. Dobrescu 2 1 Prospectiuni S.A. Caransebes Str. 1 Bucharest Romania 2 Geological Institute of Romania Caransebes Str. 1 Bucharest Romania The Baia Mare region (East Carpathians - Romania) is one of the famous ore deposit areas in Europe with a two centuries mining history (gold cooper base metal) which offered to science a huge mineralogical heritage. Geological mapping on the area began in the last decade of the 19 th
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The 3D Seismic Performance For The Thin Reservoir Evaluation In The Moesian Platform (Bilciuresti Area)
Authors M. Tanasa, C. Manea and M. CismaruO14 - 01 SEISMIC MODELLING & INTERPRETATION THE 3D SEISMIC PERFORMANCE FOR THE THIN RESERVOIR EVALUATION IN THE MOESIAN PLATFORM (BILCIURESTI AREA) Mihai Tanasa 1 Constantin Manea 1 Marin Cismaru 2 1 S.C. Prospectiuni S.A. Bucharest Romania 2 S.N. Romgaz S.A. Medias Romania Introduction. The Upper Pliocen (Meotian Sarmatian) sedimentary in the northern area of the Moesian Platform has many clastic reservoirs. Generally the reservoirs have thin thickness (average 10 m or under 10 m) and there are in the 1900-2500 m depth interval. The adequate 3D seismic works (acquisition processing and interpretation) represent the support for the identification and
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Do Seismic Attributes Reduce Exploration Risk In The Carpathian Foredeep, Northern Romania?
Authors J. Donato and L. IonescuO14 - 02 SEISMIC MODELLING & INTERPRETATION DO SEISMIC ATTRIBUTES REDUCE EXPLORATION RISK IN THE CARPATHIAN FOREDEEP NORTHERN ROMANIA? John Donato 1 Laurentiu Ionescu 2 1 Falcon Romania S.R.L. and Merlin Energy Resources Ltd. United Kingdom 2 S.N.G.N. Romgaz S.A. Romania Introduction Falcon Oil and Gas Romania s.r.l operates two Groups currently exploring three blocks located within northeastern Romania (see Figure 1): (i) Block EIII-1 (Brodina) and Block EIII-3 (Cuejdiu) Falcon Oil and Gas Romania s.r.l. (Operator) 28.75% SNGN Romgaz S.A. 37.5% Europa Oil & Gas Ltd. 28.75% Millennium Intl. Resources Corp. 5.0%. (ii) Block EIII-4 (Bacau) Falcon Oil and
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Advancing 3D Seismic Interpretation Methods For Unconventional Fractured Gas Reservoirs
By J. J. ReevesO14 - 03 SEISMIC MODELLING & INTERPRETATION ADVANCING 3D SEISMIC INTERPRETATION METHODS FOR UNCONVENTIONAL FRACTURED GAS RESERVOIRS James J. Reeves GeoSpectrum Inc. Midland TX 79702-3399 USA Fractures are often responsible for enhancing production in oil and gas reservoirs. They play an important role for defining sweet spots in many producing regions of the world. For the last 5 years Dr. James J. Reeves Principal Investigator has worked for the U. S. Department of Energy to advance a new 3D seismic interpretation method for tight gas fractured reservoirs in the San Juan Basin of New Mexico (see Reeves and Smith World
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3D Seismic Integrated Interpretation The Oligocene Of Tutana - Zarnesti Area – Getic Depression
Authors M. Vasiliu, E. Nicolae and I. CincaO14 - 04 SEISMIC MODELLING & INTERPRETATION 3D SEISMIC INTEGRATED INTERPRETATION THE OLIGOCENE OF TUTANA - ZARNESTI AREA – GETIC DEPRESSION Mirela Vasiliu 1 Eugenia Nicolae 2 Irina Cinca 1 1 PETROM S.A. Bucharest Romania 2 C.C.P.E.G. Campina Romania The Getic Depression constitutes the Tertiary foredeep that developed to the south of the Southern Carpathians and lies between Dambovita Valley to the est and the Danube to the west being bordered to the south by the Moesian Platform through the Pericarpathian fault. The Getic Depression evolved as a sedimentary basin from the Paleogene till the end of the Pliocene. Journal
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A Crustal Structure Model From The North Dobrogea Through The Vrancea Region To The Western Transylvania
Authors V. Raileanu, F. Hauser, W. Fielitz, C. Dinu, A. Bala, M. Landes and C. ProdehlO14 - 05 SEISMIC MODELLING & INTERPRETATION A CRUSTAL STRUCTURE MODEL FROM THE NORTH DOBROGEA THROUGH THE VRANCEA REGION TO THE WESTERN TRANSYLVANIA V. Raileanu 1 F. Hauser 2 W. Fielitz 2 C. Dinu 3 A. Bala 1 M. Landes 2 C. Prodehl 2 1 National Institute for Earth Physics Bucharest Romania 2 University of Karlsruhe Germany 3 University of Bucharest Romania Introduction Vrancea region is one of the highest risk seismic area from SE Europe. Two large earthquakes occurred in the last century resulting in many casualties within densely populated areas. To increase the knowledge of the causes which
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Tomography And Non-Linear Inversion In The Southeast Carpathians
Authors R. B. Raykova and G. F. PanzaO14 - 06 SEISMIC MODELLING & INTERPRETATION TOMOGRAPHY AND NON-LINEAR INVERSION IN THE SOUTHEAST CARPATHIANS Reneta B. Raykova 1 Giuliano F. Panza 2 1 Geophysical institute Sofia Bulgaria 2 DST University of Trieste and SANG group ICTP Trieste Italy Summary A set of shear-wave velocity models of the lithosphere-asthenosphere system in southeast Carpathians is determined by non-linear inversion of surface wave group velocity data. The local dispersion curves are constructed for the period range 10 -150 s combining regional and global Rayleigh wave group velocity data. The lithosphere-asthenosphere velocity structure is reliably reconstructed to depths of about 250 km. The
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The Use Of P- And S-Wave Pulses To Identify Seismic Wave Attenuation In South Eastern Carpathians Area
Authors M. Popa, E. Popescu, A. O. Placinta, M. Radulian, B. Grecu and G.F. PanzaO15 - 01 SEISMOLOGY & EARTHQUAKES THE USE OF P- AND S-WAVE PULSES TO IDENTIFY SEISMIC WAVE ATTENUATION IN SOUTH EASTERN CARPATHIANS AREA M. Popa 1 E. Popescu 1 A. O. Placinta 1 M. Radulian 1 B. Grecu 1 G.F. Panza 2 1 National Institute For Earth Physics Bucharest – Magurele Romania 2 Universita Di Trieste and Abdus Salam International Centre For Theoretical Physics Italy In many active subduction areas (e.g. Kadinsky-Cade et al. 1981; Chiu et al. 1985; Bijwaard et al. 1998; Tsumura et al. 2000) the body waves characteristics show systematic regional-scale variations in the dominant period and
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Preliminary Results Of Shear Waves Splitting At Romanian Broad-Band Network
More LessSEISMOLOGY & EARTHQUAKES O15 - 02 PRELIMINARY RESULTS OF SHEAR WAVES SPLITTING AT ROMANIAN BROAD-BAND NETWORK Summary Marian Ivan 1 Mihaela Popa 2 Daniela Ghica 2 1 University Of Bucharest Faculty of Geology and Geophysics Romania 2 National Institute for Earth Physics Bucharest - Magurele Romania Preliminary results of shear-waves splitting performed at the Romanian Broad-Band network are presented for the time period starting with 2001 January 1 st . For MLR station the average direction (25 values) of the fastest axis (D) is 52°±4° (95% confidence level) and the delay time is δt=1.1±0.1 seconds. For the broad-band instrument BUR31
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Vrancea Intermediate-Depth Earthquakes In Romania -Seismicity And Mechanisms-
Authors N. Hurukawa, M. Popa and M. RadulianO15 - 03 SEISMOLOGY & EARTHQUAKES VRANCEA INTERMEDIATE-DEPTH EARTHQUAKES IN ROMANIA -SEISMICITY AND MECHANISMS- Nobuo Hurukawa 1 Mihaela Popa 2 Mircea Radulian 2 1 International Institute of Seismology and Earthquake Engineering (IISEE) Building Research Institute Tsukuba Ibaraki 305-0802 Japan 2 National Institute of Physics of the Earth (INFP) Bucharest Romania Isolated intermediate-depth earthquakes occur at the SE corner of the Carpathian arc in central Romania. The depth ranges from 60 to 200 km and epicenters concentrate 40 km x 90 km area in Vrancea. Since there is no plate boundary at present they say there was a paleosubduiction zone. The
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Temporal Variation Profiles Of Seismicity Along Seismotectonic Zones In Greece
Authors I. Baskoutas, G. Papadopoulos, T. Rontoyianni and George StavrakakisSEISMOLOGY & EARTHQUAKES O15 - 04 TEMPORAL VARIATION PROFILES OF SEISMICITY ALONG SEISMOTECTONIC ZONES IN GREECE Ioannis Baskoutas 1 George Papadopoulos 2 Theodora Rontoyianni 3 George Stavrakakis 1 1 Geodynamic Institute National Observatory of Athens Greece 2 Earthquake Planning and Protection Organization of Greece 3 School of Mining and Metallurgical Engineering National Technical University of Athens Greece Summary Detailed temporal variation analysis of seismic parameters is performed in consecutive seismotectonic zones along NE-SW direction of Hellenic arc. in order to investigate their temporal profiles. For this investigation the logarithm of the number of earthquakes logN estimates of b-value and energy
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3D P-Wave Velocity Structure Beneath Sultandagi, Afyon, Turkey, From Local Earthquake Tomography
Authors A. N. Dinç and A. KaramanO15 - 05 SEISMOLOGY & EARTHQUAKES 3D P-WAVE VELOCITY STRUCTURE BENEATH SULTANDAĞI AFYON TURKEY FROM LOCAL EARTHQUAKE TOMOGRAPHY Aysun Nilay Dinç and Abdullah Karaman Department of Geophysics Istanbul Technical University Maslak 34469 Istanbul Turkey Summary Sultandağı fault in Afyon Turkey remains within a transition zone between the extentional tectonic regime in the west and Central Anatolia Ova Province. The Sultandağı fault had been silent until October 1 1995 earthquake with a magnitude of ML= 5.9. This earthquake was followed by two more devastating earthquakes on Februrary 3 2002 with magnitudes of Mw=6.5 and Mw=5.8. These last earthquakes inflicted damage in
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Stochastic Modelling Of The Relaxation Process After The M=9.0, Sumatra Earthquake Of December 26, 2004; Preliminary Analysis
Authors D. Gospodinov, V. Karakostas and R. PapadimitriouO15 - 06 SEISMOLOGY & EARTHQUAKES STOCHASTIC MODELLING OF THE RELAXATION PROCESS AFTER THE M=9.0 SUMATRA EARTHQUAKE OF DECEMBER 26 2004; PRELIMINARY ANALYSIS Dragomir Gospodinov 1 Vassilis Karakostas 2 Ritsa Papadimitriou 2 1 Geophysical Institute of the Bulgarian Academy of Sciences 4000 Povdiv Bulgaria 2 Geophysics Department University of Thessaloniki GR54124 Thessaloniki Greece Introduction One of the strongest earthquakes after 1900 with magnitude M=9.0 took place on December 26 in Sumatra Indonesia causing a tsunami wave and more than 150 000 casualties. The shock triggered numerous aftershocks some of them being very strong and causing secondary aftershock activity. At a
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A Study Regarding The Relationships Between Dynamic Parameters And Drillability Index Of Some Rocks
Authors R. Altindag, Z. Kamaci, A. Etiz and N. SengünO16 - 01 BOREHOLE GEOPHYSICS & PHYSICAL PROPERTIES OF ROCKS A STUDY REGARDING THE RELATIONSHIPS BETWEEN DYNAMIC PARAMETERS AND DRILLABILITY INDEX OF SOME ROCKS Raşit Altındağ 1 Züheyr Kamacı 2 Ali Etiz 2 Nazmi Şengün 1 1 SDU Department of Mining Engineering 32260 Isparta Turkey 2 SDU Department of Geophysical Engineering 32260 Isparta Turkey Summary The factors affecting the rock drillability can be divided into three main categories such as geological properties machine parameters and operating parameters. The geological properties mainly affect the drilling performance and the bit wear. Machine and the operating parameters can be somewhat controlled but the
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Bayesian Rock-Physics Inversion For Fracture Characterization
More LessBOREHOLE GEOPHYSICS & PHYSICAL PROPERTIES OF ROCKS O16 - 02 BAYESIAN ROCK-PHYSICS INVERSION FOR FRACTURE CHARACTERIZATION D. Sava 1 G. Mavko 2 1 Bureau of Economic Geology The University of Texas at Austin USA 2 Geophysics Department Stanford University USA Summary We present a methodology for quantitative integration of geological information with seismic data using rock physics theories formulated in the framework of an inverse problem. We illustrate this method with fracture characterization of hydrocarbon reservoirs. There are different types of information that can be used to study fractures such as geologic seismic and well-log and each one of them
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Determination Of Water Saturation For Anisotropic Formations
By I. MalureanuBOREHOLE GEOPHYSICS & PHYSICAL PROPERTIES OF ROCKS O16 - 03 DETERMINATION OF WATER SATURATION FOR ANISOTROPIC FORMATIONS I. Malureanu Oil and Gas University of Ploiesti Romania The calculation of water saturation in the flushed zone and uninvaded zone requires the following data: porosity true resistivity shale resistivity shale volume water resistivity and empirical factors. The evaluation of fluids saturation in shally formation is more difficult because all logs are affected by shale existence. The influence of shale depends on its amount and physical properties. A lot of equations based on physical models and experimental data.were elaborated to deteriminate the water
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Using Artificial Neural Networks To Predict Abnormal Pressures In The Anadarko Basin, Oklahoma
By C. CranganuO16 - 04 BOREHOLE GEOPHYSICS & PHYSICAL PROPERTIES OF ROCKS USING ARTIFICIAL NEURAL NETWORKS TO PREDICT ABNORMAL PRESSURES IN THE ANADARKO BASIN OKLAHOMA Constantin Cranganu The City University of New York Brooklyn College USA Summary Many sedimentary basins throughout the world exhibit areas with abnormal pore-fluid pressures (higher or lower than normal or hydrostatic pressure). Predicting pore pressure and other parameters (depth extension magnitude etc.) in such areas is a challenging task. The compressional acoustic (sonic) log (DT) is often used as a predictor because it responds to changes in porosity or compaction produced by abnormal pore-fluid pressures. Unfortunately the
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Dominante Rates Of Natural Radioelements As An Indicator Of Concentration Of Precious Elements And Polymetals
By A. DodonaO16 - 05 BOREHOLE GEOPHYSICS & PHYSICAL PROPERTIES OF ROCKS DOMINANTE RATES OF NATURAL RADIOELEMENTS AS AN INDICATOR OF CONCENTRATION OF PRECIOUS ELEMENTS AND POLYMETALS Anastas Dodona Albanian Geological Survey Geophysical-Geochemical Department Tirana Albania Gamma spectrometric surveys of natural radio elements have noticeably been developed in the recent years owing to the priorities they afford because of other geoanalytical methods. Except the values they have for the quantitative determinations of U Th K a special importance assume the values of their ratio values and first of all dominant of such values that are directly connected with non radioactive elements concentrations
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Calculation Of Heat Flow And Pn Velocity Values Of West Anotalia Using Curie Point Depth Values
Authors M. Mihci, A. Buyuksarac, O. Bektas and A. AtesO17 - 01 HEAT FLOW & GEOTHERMAL RESOURCES CALCULATION OF HEAT FLOW AND Pn VELOCITY VALUES OF WEST ANOTALIA USING CURIE POINT DEPTH VALUES Metin Mihci 1 Aydin Buyuksarac 2 Ozcan Bektas 2 Abdullah Ates 3 1 General Directorate of Iller Bankasi Turkey 2 Cumhuriyet University Department of Geophysical Engineering Turkey 3 Ankara University Department of Geophysical Engineering Turkey Summary West Anatolia exhibits an extensional regime and also it is seismically active. In this region there are widespread volcanism and geothermal resources. One of the best ways to understand the deep structure of west Anatolia is to observe Pn wave
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Exploration Of A Low-Temperature Hydrothermal System Using Geophysical Methods In Anzer Glacial Valley, Ikizdere, Rize, Turkey
Authors A. Karaman and A. N. DinçO17 - 02 Summary HEAT FLOW & GEOTHERMAL RESOURCES EXPLORATION OF A LOW-TEMPERATURE HYDROTHERMAL SYSTEM USING GEOPHYSICAL METHODS IN ANZER GLACIAL VALLEY İKIZDERE RIZE TURKEY Abdullah Karaman Aysun Nilay Dinç Istanbul Technical University Department of Geophysics Maslak 80626 İstanbul Turkey The Anzer glacier valley exhibits limited evidence for low-temperature hydrothermal system. Low-temperature hydrothermal systems are sometimes ignored since they are not useful for the energy production. However in areas where natural beauty is prominent as in the Anzer valley hydrothermal resources may add a significant value to the local economy by triggering investment for recreational centers. With this study we
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Time Dependent Thermal State Of The Litosphere In The Foreland Of The Eastern Carpathians Bend. Insights From New Geothermal Measurements And Modelling Results
Authors C. Demetrescu, H. Wilhelm, M. Tumanian, A. Damian, V. Dobrica and M. EneO17 - 03 HEAT FLOW & GEOTHERMAL RESOURCES TIME DEPENDENT THERMAL STATE OF THE LITOSPHERE IN THE FORELAND OF THE EASTERN CARPATHIANS BEND. INSIGHTS FROM NEW GEOTHERMAL MEASUREMENTS AND MODELLING RESULTS 1 2 1 1 1 1 C. Demetrescu H. Wilhelm M. Tumanian A. Damian V. Dobrica M. Ene 1 Institute of Geodynamics Bucharest Romania 2 Geophysical Institute of Karlsruhe University Germany Summary The time-dependent heat budget and thermal evolution of the lithosphere along a 120 km long profile in the foreland of the Eastern Carpathians bend is presented. The study area a complex tectonic environment in the vicinity of
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The Type Curves With Skin And Wellbore Storage Effect For Analyzing Interference Test In Naturally Fractal Reservoir
Authors T. A. Jelmert and A. MbaiO17 - 04 HEAT FLOW & GEOTHERMAL RESOURCES THE TYPE CURVES WITH SKIN AND WELLBORE STORAGE EFFECT FOR ANALYZING INTERFERENCE TEST IN NATURALLY FRACTAL RESERVOIR Tom Aage Jelmert Afar Mbai Petroleum Engineering and Applied Geophysics NTNU Trondheim Norway Summary The objective of this paper is to investigate the transient pressure behavior of naturally fractured reservoirs with fractal characteristics. This work is based on the findings of previous studies where it is shown that the networks of fractures in some reservoirs are fractals. Thus using this assumption an approximate analytical solution for fractal systems is derived in the Laplace space. By
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S-Wave Coda Q Estimates For The Regions Of Fethiye-Burdur, Büyükmenderes And Antalya Golf-Aksehir In Sw Turkey
Authors S Sahin, M. Erduran, Ö. Alptekin, Ö. Çakir and T. TezelO18 - 01 SEISMIC MODELLING & INTERPRETATION S-WAVE CODA Q ESTIMATES FOR THE REGIONS OF FETHİYE-BURDUR BÜYÜKMENDERES AND ANTALYA GOLF-AKŞEHİR IN SW TURKEY Şakir Şahin 1 Murat Erduran 2 Ömer Alptekin 3 Özcan Çakir 2 Timur Tezel 2 1 Süleyman Demirel University Department of Geophysical Engineering İsparta Turkey 2 Karadeniz Technical University Department of Geophysical Engineering Trabzon Turkey 3 İstanbul University Department of Geophysical Engineering İstanbul Turkey Summary S-wave crustal quality factors are estimated as a function of frequency at varying lapse times. Two different methods are utilized. The first method that results the coda-wave quality factor Qc is based
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Structural Characteristics, Seismic Facies And Depositional Framework Of Eocene Deposits, In Central Romanian Black Sea Offshore
Authors C. Dinu, D. Tambrea and A. RaileanuO18 - 02 SEISMIC MODELLING & INTERPRETATION STRUCTURAL CHARACTERISTICS SEISMIC FACIES AND DEPOSITIONAL FRAMEWORK OF EOCENE DEPOSITS IN CENTRAL ROMANIAN BLACK SEA OFFSHORE Corneliu Dinu 1 Dorina Tambrea 2 Adriana Raileanu 3 1 University of Bucharest Faculty of Geology and Geophysics Bucharest Romania 2 Rompetrol S.A. Bucharest Romania 3 Petrom - Geological Exploration Research and Design Center Branch Bucharest Romania Summary The analysis of seismic and well data from the Istria Depression Romanian Black Sea offshore enabled us to define an integrated model of Eocene evolution of the area.: Following Paleocene regional uplift and subaerial erosion of the Cretaceous shelf
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Incoherent Acoustic Response Of Visco-Plastic Salt Intrusions As Being Diagnostic For Abnormal Fluid Pressure Regimes In The Cilicia-Adana Basin, Ne Mediterranean Sea
More LessO18 - 03 SEISMIC MODELLING & INTERPRETATION INCOHERENT ACOUSTIC RESPONSE OF VISCO-PLASTIC SALT INTRUSIONS AS BEING DIAGNOSTIC FOR ABNORMAL FLUID PRESSURE REGIMES IN THE CILICIA-ADANA BASIN NE MEDITERRANEAN SEA Mustafa Toker 1 Vedat Ediger 2 1 Istanbul Technical University Eurasia Institute of Earth Sciences 34469 Maslak Istanbul Turkey 2 Middle East Technical University Institute of Marine Sciences 33731 Erdemli Mersin Turkey Introduction The Cilicia-Adana Basin the northeastern corner of the Mediterranean formed as a result of collisional processes is located in between Turkey and Cyprus in Figure 1. It is a downfaulted inner and peripheral region and subjected to the
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The Orientation Of The Nonlinear Stress-Strain Relations To Acoustic Parameters And Elastic Modulus For Irreversible Plastic Strain Field In The Cilicia-Adana Basin, Ne-Mediterranean Sea
More LessO18 - 04 SEISMIC MODELLING & INTERPRETATION THE ORIENTATION OF THE NONLINEAR STRESS-STRAIN RELATIONS TO ACOUSTIC PARAMETERS AND ELASTIC MODULUS FOR IRREVERSIBLE PLASTIC STRAIN FIELD IN THE CILICIA- ADANA BASIN NE-MEDITERRANEAN SEA Mustafa Toker 1 Vedat Ediger 2 1 Istanbul Technical University Eurasia Institute of Earth Sciences 34469 Maslak Istanbul Turkey 2 Middle East Technical University Institute of Marine Sciences 33731 Erdemli Mersin Turkey Introduction The Cilicia-Adana Basin in Figure 1 had intensely experienced the Messinian salinity crisis all over the Mediterranean. Messinian evaporites extensively deposited in the basin which is subjected to the great delta dynamics and the rapid
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