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Near Surface 2004 - 10th EAGE European Meeting of Environmental and Engineering Geophysics
- Conference date: 06 Sep 2004 - 09 Sep 2004
- Location: Utrecht, Netherlands
- Published: 06 September 2004
61 - 80 of 132 results
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Offset-Variant Optimum Time Window for Near-Surface Seismic Reflection Data
By K.Y. KimB027 OFFSET-VARIANT OPTIMUM TIME WINDOW FOR NEAR-SURFACE SEISMIC REFLECTION DATA Abstract 1 K. Y. KIM Kangwon National University 192-1 Hyoja2-dong Chunchon-si Kangwon-do Republic of Korea To minimize processing efforts and avoid processing artifacts caused by extreme velocity gradients of shallow seismic data a quick and robust method utilizing optimum time windows varying with offset is proposed and applied to real data. The offset-variant optimum time window (OOTW) is defined as a time window where primary reflection signals are well separated from each other and isolated from shot-generated seismic noise. In the OOTW method seismic signals are stacked in the optimum
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Some Pitfalls Associated with Dominant Higher-Mode Surface-Wave Inversion
Authors A. O‘Neill, T. Matsuoka and K. TsukadaB028 SOME PITFALLS ASSOCIATED WITH DOMINANT HIGHER-MODE SURFACE-WAVE INVERSION 1 ADAM O’NEILL TOSHIFUMI MATSUOKA KAZUHIKO TSUKADA Department of Civil and Earth Resources Engineering Kyoto University Yoshida KYOTO 606-8501 Japan Low- and high-velocity layer dispersion Dominant higher modes of seismic surface waves are generated in low- and high-velocity layer cases typical of many engineering sites. Figure 1 shows three synthetic models and Figure 2 the ‘effective’ dispersion curves from full-waveform synthetic seismograms overlain on the plane-wave ‘modal’ dispersion curves. These types of dispersion curves both synthetically generated and observed at field sites were successfully inverted by linear optimisation using a forward
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3-D Multi-Component Shearwave Seismic – A New Tool for Near Surface Prospecting?
More LessB029 3-D MULTI-COMPONENT SHEARWAVE SEISMIC – A NEW TOOL FOR NEAR SURFACE PROSPECTING? Summary 1 We present a “true” 3-D shearwave refraction survey of an archaeological site in western Turkey performed for near surface basement mapping in a 1*1 m precision. Data were acquired in both three geophone and three shot components showing spectacular effects of wave propagation. Special wavefront processing and decomposition techniques were developed in order to handle effects of strong basement topography and refraction sideswipe. Introduction Geophysical work in the alluvial sedimentary environment of the archaeological site in Miletus' Lions' Harbour (Turkey) raised the question whether prominent
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Detection of Artificial Cavities Using Very High-Resolution Seismic
Authors O. Monnereau, J.L. Deherripont and C. BoulangerB030 DETECTION OF ARTIFICIAL CAVITIES USING VERY HIGH-RESOLUTION SEISMIC Introduction 1 O. MONNEREAU 1 J.L. DEHERRIPONT 2 C. BOULANGER 1 1 CGG France 1 rue Léon Migaux F-91341 Massy cedex 2 SNCF 6 avenue François Mitterand F-93574 La Plaine Saint Denis cedex In front of the problems related to the risk due to cavities (natural or artificial) on the TGV Nord Line (the High Speed Line Track in Northern France) SNCF (the French National Railway Company) developed a geophysical tests site on a siding that has the same structure as a traffic track in station TGV Haute-Picardie (figure 1) the
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From Shallow Land Seismic to Regional Geological Knowledge in the Aigion Active Fault Area, Gulf of Corinth, Greece
Authors P. Thierry, F. Lemeille and D. Sorel1 B031 FROM SHALLOW LAND SEISMIC TO REGIONAL GEOLOGICAL KNOWLEDGE IN THE AIGION ACTIVE FAULT AREA GULF OF CORINTH GREECE 1 2 3 P. THIERRY F. LEMEILLLE AND D. SOREL 1 Ecole des Mines de Paris Fontainebleau France 2 Institut de Radioprotection et de Sûreté Nucléaire Fontenay aux Roses France 3 Université Paris Sud Orsay France Summary We present the processing and the interpretation of a 2D shallow reflection seismic acquired in the vicinity of the Aigion active fault in the Gulf of Corinth Greece. This area is widely used in the frame of European projects to understand the whole
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Seismic Characterization of a Contaminated Site Using a Multi-Approach Technique
Authors G. Grandjean and A. BitriB032 SEISMIC CHARACTERIZATION OF A CONTAMINATED SITE USING A MULTI-APPROACH TECHNIQUE Introduction G.GRANDJEAN and A.BITRI BRGM BP 6009 Orléans France Since several decades numerous studies on contaminated sites have demonstrated that the physical characterization of the soils remains an important process that conditions the efficiency of remediation techniques. Improvement in safety and substantial cost savings can be realized with the appropriate use of geophysical methods. Of course the understanding of the limitations and applications of each method is critical to its success. As examples ground-penetrating radar is a suitable tool for delimiting the contamination plumes geometry (Grumman and Daniels 1995)
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Monitoring an Alternative De-Icer in Salt Contaminated Aquifer Using ERT
Authors T. Huotari, H. Vanhala, P. Hellstén and K. VaittinenB033 MONITORING AN ALTERNATIVE DE-ICER IN SALT CONTAMINATED AQUIFER USING ERT Summary 1 A new de-icer potassium formate was tested at a salt (NaCl) contaminated Kauriansalmi aquifer during winter 2002-2003. Electrical resistivity tomography (ERT) data was acquired 2002 and 2003 for mapping the geology of the area and for monitoring the effect of the alternative de-icer on the salt concentration of the groundwater. A 3-D model of the aquifer was formed using information carried out by ERT ground penetrating radar (GPR) borehole drillings and other available data. The bedrock topography model was a valuable tool in the interpretation of the
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Surface Geophysical Survey for Fly Ash Water Seepage Detection at Loy Yang Coal Mine
Authors A. Viezzoli, J.P. Cull and D. MassieB034 SURFACE GEOPHYSICAL SURVEY FOR FLY ASH WATER SEEPAGE DETECTION AT LOY YANG COAL MINE Summary 1 The fly ash water pond at Loy Yang Power station (Australia) presents high TDS content. It leaks into the shallow aquifer and affects groundwater quality. The existing boreholes monitoring network intercepts points of highly conductive groundwater but does not provide sufficient information on plume flow paths for remediation purposes. This paper reports the results of electrical and electromagnetic surface surveys applied to high resolution 3 D mapping of the seepage path. Galvanic and TEM techniques successfully identified the plume providing valuable information for
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Characterizing Tailings Impoundment at the Closed Hammaslahti Cu-Zn Mine, Finland
Authors H. Vanhala, M.-L. Räisänen, T. Huotari, T. Valjus, J. Lehtimäki and I. SuppalaB035 CHARACTERIZING TAILINGS IMPOUNDMENT AT THE CLOSED HAMMASLAHTI CU-ZN MINE FINLAND Summary 1 *H.VANHALA 1 M-L.RÄISÄNEN 2 T.HUOTARI 1 T.VALJUS 1 J. LEHTIMÄKI 1 and I. SUPPALA 1 1 Geological Survey of Finland (GTK) Betonimiehenkuja 4 FIN-02150 Espoo Finland Acid mine drainage (AMD) results when sulphide bearing tailings sand is exposed to air and water. Oxidation of sulphide minerals and release of acid and dissolved metals in tailings impoundments can last for tens to hundreds of years. Rehabilitation risk analysis and risk assessment of the old tailings impoundments require detailed information on the structure mineralogy and chemistry as well as
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Interdisciplinary Waste Site Investigation in Balassagyarmat / Hungary (NORISC-Project)
More LessB036 INTERDISCIPLINARY WASTE SITE INVESTIGATION IN BALASSAGYARMAT / HUNGARY (NORISC-PROJECT) 1 M. PERK° B. TEZKAN° A. HÖRDT^ AND THE NORISC TEAM ° Institute f. Geophysics & Meteorology University of Cologne ^ Geological Institute Department of Applied Geophysics University Bonn Introduction Within the NORISC-project (Network-Oriented Risk-assessment by In-Situ screening of Contaminated sites; www.norisc.com) which is part of the 5.the framework programme of the EU for Energy environment and sustainable development a tool for city planers engineering offices und environmental offices was developed to investigate waste sites in a effective time- and costreducing way compared to standard investigations. Different methods from various
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Geophysical Investigations of a Waste Disposal in Urban Environment
Authors D. Fielitz and M. DegutschB037 GEOPHYSICAL INVESTIGATIONS OF A WASTE DISPOSAL IN URBAN ENVIRONMENT 1 DANIEL FIELITZ MANFRED DEGUTSCH Institute of Geophysics Corrensstr. 24 48149 Muenster email: [email protected] Abstract An extended geophysical survey using magnetic resistivity and seismic methods has been carried out in a complicated area in the city of Muenster. The purpose was to map the boundary between an old waste disposal site and the underlying “Muensterlaender Kiessandzug”. The results reveal that the disposal extends to a depth of approximately 15m with resistivity values between 70 Ohm*m and 200 Ohm*m and p-velocities ranging from 400 m/s to 600 m/s. Introduction The aim
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The Use of Borehole Radar Tomography to Monitor a Steam Injection Pilot Study in a Contaminated Fractured Limestone (Maine, USA)
Authors C. Grégoire, J.W. Lane and P.K. JoestenB038 THE USE OF BOREHOLE RADAR TOMOGRAPHY TO MONITOR A STEAM INJECTION PILOT STUDY IN A CONTAMINATED FRACTURED LIMESTONE (MAINE USA) 1 Colette Grégoire (*) John W. Lane Jr. (**) and Peter K. Joesten (**) (*) KULeuven Department Civil Engineering Kasteelpark Arenberg 40 3001 Leuven Belgium [email protected] (**) U.S. Geological Survey Branch of Geophysics 11 Sherman Place Unit 5015 Storrs Mansfield CT 06269 United States Abstract Steam-enhanced remediation (SER) has been successfully used to remove DNAPL and LNAPL contaminants from porous media. Between August and November of 2002 SER was tested in a fractured limestone at the former Loring Air
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Application of Geophysical Methods for Detection of Cavities in Khalifa City (B) of Abu Dhabi Emirate, U.A.E.
Authors B. Li, A. Taleb and H. Al JafriP001 APPLICATION OF GEOPHYSICAL METHODS FOR DETECTION OF CAVITIES IN KHALIFA CITY (B) OF ABU DHABI EMIRATE U.A.E. 1 Introduction Cavities have been encountered during the construction of infrastructure in Khalifa City (B) Emirate of Abu Dhabi. Heavy groundwater flow through cavities delayed the works for months and resulted in claim by contractors. Moreover cavities are considered hazardous to the future building structures. A geotechnical investigation involving boreholes laboratory test and geophysical survey has been conducted in Khalifa City (B) since 1999. Approximately 1100 line kilometer of geophysical survey has been completed. An integrated risk map has been produced classifying
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Oil Polluted Zones Mapping by Geoelectric Methods
Authors N.A. Yakymchuk, S.P. Levashov, I.N. Korchagin and J.M. PyschaniyP002 OIL POLLUTED ZONES MAPPING BY GEOELECTRIC METHODS 1 S.P. LEVASHOV 1 N.A. YAKYMCHUK 1 I.N. KORCHAGIN 2 JU.M. PYSCHANIY 2 1 Institute of applied problems of Ecology Geophysics and Geochemistry Laboratory lane 1 Kyiv 01133 Ukraine e-mail: [email protected] [email protected] 2 Institute of Geophysics of Ukraine National Academy of Science e-mail: [email protected] Abstract. This paper provides the results of applying the technology of identifying and contouring sections polluted by oil by means of geoelectric methods. The technology enables us to mark out zones of tectonic disruptions on examined sections; map zones polluted by oil and identify the ways of a
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Refraction Seismic Survey to Evaluate the Danger of Ground Surface Damage in Mining Areas
By J.A. DecP003 REFRACTION SEISMIC SURVEY TO EVALUATE THE DANGER OF GROUND SURFACE DAMAGE IN MINING AREAS 1 Abstract Extensive seismic survey was carried out over the mining area of the Katowice-Kleofas coal mine in Katowice Poland. The survey covered the area of old shallow workings which pose the risk of ground surface damage. The aims of the survey included evaluation of properties of rocks occurring beneath the Carboniferous top evaluation of the continuity of the Carboniferous top surface and evaluation of the risk of surface damage. The Carboniferous rocks are covered by Quaternary deposits: loamy sands and clays of a few
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Large-Scale Geophysical Studies in the Legio IV Scythica in Zeugma-Turkey
Authors M.G. Drahor, M. Hartmann and M.A. SpiedelP004 LARGE-SCALE GEOPHYSICAL STUDIES IN THE LEGIO IV SCYTHICA IN ZEUGMA-TURKEY Abstract 1 MAHMUT G. DRAHOR 1 MARTIN HARTMANN 2 AND MICHAEL A. SPIEDEL 2 * Dokuz Eylül University Engineering Faculty Dept. Of Geophysics 35160 Kaynaklar Campus Buca-Izmir/Turkey + HIstorIsches InstItut Abt. Alte GeschIchte u. EpIgraphIk Länggassstr. 49 CH-3000 Bern 9 / Switzerland. Zeugma was the most important city between the Mesopotamia and Mediterranean in the antique era and the city was also the main passing point in the Euphrates River. Zeugma and Apameia city were at the opposite sites of the river Euphrates and these cities were established in
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GPR and ERT – Integrated Geophysical Methods in Archaeology
Authors L. Baradello, A. Bratus and D.N. YabarP005 GPR AND ERT – INTEGRATED GEOPHYSICAL METHODS IN ARCHAEOLOGY Abstract 1 This work is a case history about an archaeological survey with two geophysical integrated methods: Ground Penetrating Radar and Electrical Resistivity Tomography. The principal objective of our research was to detect the ruins of a medieval castle in Friuli a north-east region of Italy. Introduction Ground Penetrating Radar (GPR) is a high resolution electromagnetic technique used for identifying possible buried objects in shallow investigations (Davis and Annan 1989). For this motive GPR is often employed in archaeological field for the search of ancient ruins walls and human manufactured
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The Use of Geophysical Methods in the Investigation of Subsurface Waters in Albania
Authors L.L. Lleshi and V. AzizajP006 THE USE OF GEOPHYSICAL METHODS IN THE INVESTIGATION OF SUBSURFACE WATERS IN ALBANIA 1 LL. LLESHI 1 V. AZIZAJ 1 1 Geophysical Center of Tirana L.9 Blloku Vasil Shanto Tirana Albania Introduction The geophysical methods and particularly the electrical methods are widely used in the investigation of subsurface waters in many regions of Albania. Last years the growth of demography and the need of community for drinking -water has led to the increase of the geophysical explorations carried out in the service of hydrogeology. Nowadays the most part of geophysical explorations consists in this research topic. In this paper
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Monitoring Tracer Experiments at the Krauthausen Test Site Using Time-Lapse ERT
Authors A. Kemna, J. Vanderborght, K. Borgers, K. Gößling, A. Verweerd, A. Englert, K. Müller and H. VereeckenP007 MONITORING TRACER EXPERIMENTS AT THE KRAUTHAUSEN TEST SITE USING TIME- LAPSE ERT Abstract 1 Time-lapse electrical resistance tomography (ERT) has proven significant potential to image solute plumes in the subsurface. We here report on the use of time-lapse ERT to monitor two tracer experiments conducted in a heterogeneous aquifer at the Krauthausen test site Germany. The two experiments were carried out under similar hydrological boundary conditions but one time with an electrically conductive (“positive”) tracer the other time with a resistive (“negative”) tracer. Based on earlier synthetic studies on the capability of 2D ERT imaging to characterize 3D transport
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Estimate of the Aperture of Watersaturated Fractures by Nuclear Magnetic Resonance Logging
Authors Y. Nakashima and T. KikuchiP008 ESTIMATE OF THE APERTURE OF WATER- SATURATED FRACTURES BY NUCLEAR MAGNETIC RESONANCE LOGGING Abstract 1 Nuclear magnetic resonance (NMR) well logging is a technique to measure the transport properties of fluid-saturated porous strata by analyzing the proton NMR signals from the hydrogen-bearing fluid molecules. We applied the technique to a borehole in an andesite lava formation (Akita Japan) to estimate the aperture of fractures embedded in the lava. A fracture (depth 61.2 m) responsible for the total loss of circulation during the drilling was scanned by a Schlumberger NMR sonde to obtain the bulk-fluid porosity of the fracture filled
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