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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
1 - 20 of 142 results
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Applied Geophysics Code of Good Practice
More LessThere is a need for clients for the evaluation of geophysical servicing companies. The French companies, which untill too years ago did not possess any professional organization, have set a group to work in the direction of a better quality insurance geophysical service.
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Monitoring Creep Movements by Seismic Refraction
Authors I. Campagnoli and G. SantaratoThe Italian Apenninic area is a well known example of hydrogeological and landslide hazard, due to recent largely incoherent shallow formations like clay, sandstone, flysch. When artifacts must be built as roads, bridges, dams..., a very careful study of buried geology and lithological properties must be performed in advance, resorting to intensive geotechnical and geophysical surveys, to evaluate both geometry and mechanical properties of the shallowest formations.
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Monitoring a Landslide in Baiso by GPS Survey
Authors E. Baj and A. ColombettiThe extent to which landslides are monitored before and after the stabilisation work is limited by the high costs involved. Furthermore the more common measuring instrument, the inclinometer, is rendered useless when movement begins again and must therefore be replaced.
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Acoustic Emission and Landslide Investigation
By P. BlahaThe geoacoustic method is one of the less known geophysical methods. This method tracks natural elastic waves that are generated due to rock mass disturbances. The method is sometimes known in literature as "acoustic emissions" or the "rock noise method".
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Determination of Water Flow at the Base of a Large Landslide by Resistivity Methods
Authors A. Carbo‘Gorosabel and A. Casas PonsatiLarge Engineering works caused a 1.5 -m3- landslide on a valley slope. The material consist of coluvium: sand, silty sand overlying folded carbonifeous mudstones and sandstones. The slip plane underlies the coluvium where a clayey bed derived from the weathering of the basement favoured the landslide. The major movements are produced after raining periods. The objective is to figure out the slip plane location and the main water flow areas.
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GPR Investigations to Evaluate Geometric Features of Rock Slides and Bucklings in a Limestone Formation in Northern Italy
Authors S. E. Beaubien, F. Galadini, P. Tommasi and E. PettinelliIn recent years the application of ground penetrating radar (GPR) has been extended to a large number of geotechnical and engineering geology problems (see 5th Int. Conf on GPR, Kitchener, Canada 1995).
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VLF Measurements Applied to Landslide Investigations
Authors W. Stiefelhagen, I. Muller, H. Raetzo and O. LateltinVLF measurements are playing already some important role in the field of urineral exploration, waste deposit investigation and investigations of kanstic media. In more porous media the application of the VLF method seems to be more difficult. Nevertheless we tried to evaluate this method for the investigation of land slides in Switzerland. Surprisingly we could clearly identify some borders of the biggest recent land slide (Falli Hölli, Canton Fribourg) in Switzerland.
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Broad Band Complex Conductivity Tomography for Environmental Applications
Authors F. Borner, M. Gruhne, L. Halleux, A. Kampke, A. Weller, J. Kulenkampff and T. RichterThe properties of porous rock and soils , i.e. fluid flow permeability, sorptivity, fluid phase distribution and composition are of great interest in environmental site characterization and hydrogeological applications. Additionally, recent environmental research include the - representative determination of input parameters for groundwater and migration modelling, - noninvasive evaluation of the condition of the multiphase system subsurface - monitoring the remediation of contaminated groundwater and soil zones
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Limits of Surface Resistivity Methods in Determining Transient Parameters by Mathematical Modelling
Authors O. Mazac, I. Landa and W. E. KellyKnowledge of transient parameters (e.g., direction and velocity of groundwater or pollution flow, dispersive parameters) is necessary for analyzing pollution procesces in an aquifer. For determining the parameters, many traditional and well elaborated methods have been applied.
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Geoelectric Monitoring of a Tracer Experiment at Haslemoen, Norway, during the Winter of 1995
Authors M. Morris, O. B. Lile and J. S. RonningRecent studies have focused on the use of the geoelectrical method to monitor tracer experiments (Bevc and Morrison 1991, Karous 1993, White 1995). Geoelectrical monitoring is suggested as a replacement or as a supplement to traditional tracer experiments, which require taking actual samples of groundwater. The aim of tracer experiments is to determine hydrological parameters such as e.g. groundwater flow direction or velocity of flow.
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Detection of Contaminated Groundwater by Geoelectrical Methods
More LessHeavily contaminated groundwater usually contains quite large amount of dissolved salt. It can be expected that porous materials saturated with water of higher concentration can be characterized by lower electrical resistivity than those saturated with clean (fresh) water. Therefore different resistivity methods may be good indicators of contaminated groundwaters.
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Investigation and Simulation of Free Phase Hydrocarbon Subsurface Flaw
More LessProblems due to groundwater contamination by hydrocarbons emerged in the eighties in Hungary, similarly to the rest of the world. Contamination of subsurface water cannot be easily detected, delineation of a hydrocarbon pollution is an even more difficult task because complex problem encountered. To solve these we have to use many different methods and operations and we have to extend our scope to further disciplines and branches of science.
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Hydrocarbon Contamination around Soviet Military Bases
More LessIn the spring of 1990 the Hungarian and Soviet ministers of foreign affairs signed a protocol on the withdrawal of the Soviet troops from the territory of Hungary. According to this protocol the damage to the environment caused in almost 35 years could be assessed in 171 bases prior to the complete withdrawal. Methods of assessment were selected by a joint Hungarian-Soviet expert team.
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Electrical Effects of Pollutants in Earth Soils and Sedimentary Rocks
Authors G. Losito, M. Muschietti and A. TrovaThis work is the development of a laboratory study carried out during the last years to investigate pollution effects in sedimentary rocks. The used method is an extention of the geolelectrical method and is based on the spectral analisys of the output signals (Losito and Trova; 1981).
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Engineering Geophysics in the New German Governmental Area in the Centre of Berlin
Authors C. Gelbke, E. Raekers, B. Lehman and P. AlthausAfter reunification of Germany in 1989, the government decided that Berlin instead of Bonn will be the capital of Germany. Therefore new governmental buildings as well as underground road and railways shall be erected in the centre of Berlin until 1999. The specific area had to be surveyed with engineering geophysical and geotechnical methods. This was certainly the largest area for investigations with engineering geophysics in Germany, maybe in Europe (Fig 1 only shows half of the total surveyed area)
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Seismic Tomography in Shallow Geology
By P. BlahaTomography is a new method for processing the data obtained by radiography. Tomography has gradually found its way into the processing of geophysical measurements. The first tomographic applications were made for the processing of seismic measurements.
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Geotechnical Applications of Seismic Tomography: Case Histories
Authors E. Toros and L. HermannThe essence and the main advantage of tomographic methods are that they able to map the distribution of physical parameters inside a volume from the sequence of measurements performed on the perimeter of the domain.
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Preliminary Experiments with Radar Tomography for Civil Engineering
More LessPreliminary tests on laboratory models enable us to provide guidelines for traveltime ray tomography with G.P.R. applied to civil engineering problems, specifically to find voids in pillars, walls and structures. The width of the Fresnel zone and the source and receiver locations are the limits to resolution capabilities. For crosshole geometry a criterion to know resolution capabilities, based on detectable wavenumbers, is analytically derived.
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On Site Sonic Tomography Data Processing and Analysis for Dam Investigations
Authors P. Angeloni, G. Bettolo, S. Superbo and A. ZaninettiIn Italy, sonic methods (using elastic waves in the sonic frequency range) for monitoring dams have been in use for about 30 years, in the framework of ENEL's project regarding the systematic monitoring and restoring of old dams. The investigated dams are made of both reinforced concrete and masonry.
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Environmental and Structural Dynamic Monitoring Using High Dynamic Seismic Acquisition Systems
Authors P. Angeloni, G. Gardini, M. Mucciarelli and A. ZaninettiThe need for a wider and even more efficient monitoring for the safety of important civil works like dams has been a key element for stimulating the development and evolution of investigation methodologies and more and more sophisticated monitoring systems.
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