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1st EEGS Meeting
- Conference date: 25 Sep 1995 - 29 Sep 1995
- Location: Torino, Italy
- ISBN: 978-94-6282-129-3
- Published: 25 September 1995
81 - 100 of 142 results
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Electromagnetic Auscuftation on Brick Masonry
Authors X. Dérobert, P. Cote and N. Lecocq-LeventSeveral types of auscultation techniques have been tested on brick masonry monuments during the first part of a research program from the CEE "Environment program" (contract EV5V CT 92 - 0106: NDT and system identification to evaluate diagnostics methods and reinforcement techniques applied to historical buildings). We have selected two main sites in Italy: a wall of a Scuola in Venice and a part of rampart in Montagnana.
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The Use of Seismic Prospecting for Prediction of Ground Vibrations
Authors D. Jongmans and C. HorrentIn the last few years, concern about vibrations generated by civil engineering work has dramatically increased. The main seismic wave sources are pile and tie-back driving, quarry blasts, drilling operations and road or train traffic. In inhabited areas such vibrations may have an important impact on people and buildings and may constitute a major problem for the environment.
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Earthquakes 5 pm Daily ?? A Seismic Study to Identify Underground Acoustic Noise Sources
More LessRegular love frequency noises, very similar to distant earthquakes, were reported to the Eotvos Lorand Geophysical Institute in Veszprem, west Hungary, in 1995. Reports came from a small, densely populated urban area, describing the phenomena as frequent, frightening booms, sometimes accompanied by slight ground vibrations.
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Predicting Distribution of Intensity of Ground Vibrations Produced by Blasting
Authors S. Lasocki, J. Matuszyk and M. SzybinskiExplosives are extensively used in underground and open-cast mining, in civil engineering and hydrotechnics, and also in geophysical (seismic) prospecting. Detonation of explosives is a source of ground vibrations which can be hazardous for surrounding buildings and structures.
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A New Procedure to Perform Differential Gravity Measurements
Authors L. Sambuelli and G. RanieriIn a previous work the authors studied the possibility of performing differential underground gravity measurements to detect voids or altered or mineralized rock volumes near tunnels using a new procedure (Ranieri G., Sambuelli L. 1991).
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Advances in ERT Interpretation Methods
Authors D. J. Labrecque and G. MorelliThe objective of electrical resistance tomography (ERT) is to provide images of the subsurface electrical resistivity distribution. Electrical resistivity is a function of the pore water saturation, pore water salinity and soil/rock clay content.
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Improved Near-Surface Geoelectrical Mapping and Interpretation
Authors I. Moller and K. I. SorensenThe electrical profiling method and vertical sounding method are powerful techniques for mapping the near surface geology, e.g. in groundwater investigations, in prospecting for raw materials and in geotechnical investigations.
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Occam's Inversíon of 3D ERT Field Data
Authors G. Morelli and D. J. LabrecqueThe ERT method seeks to image the electrical resistivity of the subsurface by making measurements using numerous combinations of electrodes placed on or below the surface of the earth. It is the nature of the ERT method that the data obtained can only be interpreted using multi-dimensional inverse modeling.
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The Assessment of Hydraulic Properties from Geophysical Data: Groundwater Protective Layers
More LessThe protection of our groundwater resources against pollution from industry, agriculture, or waste dumps is mainly given by layers of low hydraulic conductivity. In Quaternary deposits these layers consist of clay or marl, a sand-clay mixture.
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New Strategies for Surface and Borehole Electromagnetic Methods in Hydrogeophysical Investigations
Authors N. B. Christensen and K. I. SorensenThe widespread problems with the quality of ground water call on the one hand for a much more detailed and on the other hand a regional covering with geophysical data, when performing a hydrogeophysical investigation.
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Use of Conductivity Survey in Defining a Policy of Rehabiltation of a Salt Affected Oasis in Tunisia
Authors J. O. Job, Y. Albouy, G. Bellier, N. Gaaloul, M. Arfaoui, F. Khalifa, M. Gasmi and B. AskriSegdoud is an oasis situated at 70 km south-ouest of Gafsa, south Tunisia (Fig. 1) downwards small colluvial fans produced by quaternary wadis, descending from cretaceous Jebel el Negueb. This material, interbedded with mio-pliocène clays and marls, and ancient terrases of oued Mit is rich in gypsum and magnesium salts.
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Experiences of 2-D Geoelectrical Imaging
Authors P. Chiara, A. Godio, L. V. Socco and A. ZerilliOver the past three years we have carried out several two-dimensional (2-D) electrical imaging in order to verify the reliability of this technology in different environmental and geological conditions. The 2-D resistivity imaging method is in wide use and successfully employed for detecting pollutants diffusion, in groundwater monitoring, in buried bodies and cavities detection problems.
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Contribution of Electrical and Electromagnetic Methods to a Dump Site Reconnaissance near Paris
Authors A. Bouvier and L. FrobertOld quarries of limestones, gypsum, sands or clays have been frequently used as rubbish tips over the years. New rules and environmental recommandations to avert or limit spreading of polluting substances have forced the municipalities to take actions for the treatment of polluted soils and rehabilitation of dump sites.
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Integrated Geophysical Methods for Sensing Buried Wastes in Abandoned Gravel Pits near Barcelona (Spain)
Authors E. Busquet, A. Casas, V. Pinto and L. RiveroThe industrial expansion of Barcelona city and their metropolitan area of influence during the sixthy's and seventy's gived as consequence an important inquiry for building materials. Many gravel-pits were intensively exploted, and when abandoned, converted into uncontrolled landfills refilled with industrial and domestic wastes (fig. 1).
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Integrated Interpretation of RMT Data and Borehole Results on a Waste Site near Cologne
More LessWaste sites are usually characterized by high electrical conductivities compared with surrounding geological structures. The Radiomagnetotelluric (RMT) technique is very efficient in waste disposal exploration. It uses radiotransmitters in the frequency range between 10 kHz and 300 kHz. Two horizontal electric and magnetic field components are measured from radiotransmitters perpendicular to each other. The observed transfer functions (e.g. apparent resistivity and phase data) are interpreted in the same way as it is usually done with magnetotelluric data.
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3D Visualisation of a Waste Deposit near Huttenried (Bavaria) using Radio Magnetotelluric Data
Authors G. Zacher, B. Tezkan, F. M. Neubauer and I. MullerThe application of geophysical methods to waste disposal investigation becomes increasingly popular since their contribution to the pollution risk estimation is being recognized. In particular geophysical methods are faster and more cost-effective than conventional drilling. Waste sites are usually characterized by a high electrical conductivity compared with surrounding geological structures.
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Determination of Physical Parameters of Urban Waste Dumps Via Integrated Geophysical Methods
Authors M. Bernabini, E. Cardarelli and C. TedeschiDuring the last few years Applied Geophysics has further extended its field of action to the study of problems related to environment protestion, in particular to the discharge of urban wastes.
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Integrated Geophysical Survey Across a Waste Disposal Site
Authors E. Lanz, A. Pugin, H. Horstmeyer and A. GreenOver the past decade there has been a significant increase in the demand for engineering geophysical solutions to problems associated witti the unconsolidated sedimentary layers of the shallow subsurface. A whole palette of geophysical techniques is available for studying the upper tens of meters of the underground, with a trend toward higher resolution surveying. In Switzerland, as in most other countries, large quantities of industrial and household waste have been buried in landfill sites. For many of the older sites, there is a lack of credible information concernmg the exact location, dimensions and contents of the site.
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Reflection Profiling Using Engineering Seismic Equipment - a Case History from Slovenia
By A. GosarSeveral seismic reflection surveys were carried out in last years in Slovenia using 24 channel engineering seismograph, single geophone per channel and personal computer based processing software. Their scope was mainly within hydrogeological investigations and for locating faults. A reflection line recorded near the Krsko nuclear power plant (NPP) site, reported here, is used to present the optimization of acquisition parameters.
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