Image processing of 2D resistivity data for imaging faults

Nguyen, Frédéric; Garambois, Stéphane; Jongmans, Denis; Pirard, Eric; Loke, M.H.

doi:10.1016/j.jappgeo.2005.02.001

Cited by 102 publications

(64 citation statements)

References 29 publications

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“…The second issue is the image smoothness caused by most of the inversion techniques used in geophysical tomography, resulting in an inability to determine sharp layer interfaces [Wisen et al, 2003]. Also, new techniques for solving this problem are emerging, using a priori information [ Wisen et al, 2005], regularization for favouring sharp boundaries in the inversion process [Zhadov, 2002] or image processing tools such as crest lines extraction process in gradient images [Nguyen et al, 2005]. Finally, most of the existing images are 2D, while a landslide is a 3D phenomenon.…”

Section: Geophysical Methods: An Overviewmentioning

confidence: 99%

Geophysical investigation of landslides : a review

Jongmans

Garambois

2007

Bulletin De La Société Géologique De France

330

176

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Abstract. -In the last two decades, shallow geophysics has considerably evolved with the emergence of 2D spatial imaging, then 3D spatial imaging and now 4D time and space imaging. These techniques allow the study of the spatial and temporal variations of geological structures. This paper aims at presenting a current state-of-the-art on the application of surface geophysical methods to landslide characterization and focuses on recent papers (after 1990) published in peer-reviewed International Journals. Until recently, geophysical techniques have been relatively little used for the reconnaissance of landslides for at least two main reasons. The first one is that geophysical methods provide images in terms of physical parameters which are not directly linked to the geological and mechanical properties required by geologists and engineers. The second reason shown through this study probably comes from a tendency among a part of the geophysicists to overestimate the quality and reliability of the results. This paper gave the opportunity to review recent applications of the main geophysical techniques to landslide characterisation, showing both their interest and their limits. We also emphasized the geophysical image characteristics (resolution, penetration depth) which have to be provided for assessing their reliability, as well as the absolute requirements to combine geophysical methods and to calibrate them with existing geological and geotechnical data. We hope that this paper will contribute to fill the gaps between communities and to strength of using appropriate geophysical methods for landslide investigation. Reconnaissance géophysique des glissements de terrain : Etat de l'artMots clés. -Glissements de terrain, Investigations géophysiques, Etat de l'art Résumé. -Depuis 20 ans, la prospection géophysique à faible profondeur a considérablement évolué avec l'apparition de techniques d'imagerie 2D (x,z), puis 3D (x,y,z) et maintenant 4D (x,y,z,t), qui permettent de considérer les variations spatiales et temporelles des objets géologiques étudiés. A partir de la littérature internationale, nous tentons de faire une synthèse sur l'application des méthodes géophysiques à l'étude et au suivi des mouvements de terrain qui sont des structures complexes et évolutives. Paradoxalement, il apparaît que l'utilisation des techniques géophysiques pour la reconnaissance des mouvements de terrain est restée jusque récemment relativement limitée pour deux raisons principales. La première vient de la réticence d'une partie des ingénieurs et des géologues d'appliquer des techniques complexes qui ne fournissent pas des données géologiques, hydrogéologiques ou mécaniques directement utilisables. La seconde raison, apparue lors de cette étude, résulte de la tendance d'une partie de la communauté géophysique de surestimer la qualité et la fiabilité des résultats obtenus. A travers cette synthèse des publications, nous passons en revue les applications récentes des principales méthodes géophysiques aux mouvements de terrain en illust...

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Section: Geophysical Methods: An Overviewmentioning

confidence: 99%

Geophysical investigation of landslides : a review

Jongmans

Garambois

2007

Bulletin De La Société Géologique De France

330

176

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“…Among these methods, Electrical Resistivity Tomography (ERT) allows to conduct fast data acquisition and to obtain underground 2D images with high resolution suitable for fracture identification [9].…”

Section: D Inversion Of Dcr Tomography Datamentioning

confidence: 99%

Geoelectrical Tomography Investigating and Modeling of Fractures Network around Bittit Spring (Middle Atlas, Morocco)

Qarqori

Rouai

Moreau

et al. 2012

International Journal of Geophysics

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Direct current Resistivity (DCR) method was carried out to characterize the hydrogeological connection between the Tabular Middle Atlas (TMA) and the Saïs Basin. The TMA is one of the most important aquifers in northern Morocco that supplies the deep aquifer of the Saïs Basin. Electrical resistivity tomography (ERT) survey was focused on the Bittit area that is one of the most important outlet discharges, and it is representative of the relations between the TMA and the Saïs Basin. The high resolution capabilities of the electrical tomography were used to define the geological draining features in the framework of water paths from the TMA to the karstic springs. The synthetic data were calculated for the similar model expected in field data inversion and inversion result of these synthetic data used as a guide for the interpretation of the inverse data resistivity sections. Joint interpretation of geophysical, geological, structural, and synthetic simulation data allowed identifying a conductive horizontal shallow layer overlying two subvertical families of fractures of NE-SW and NW-SE directions. This result leads to propose hydrological behaviour of water from the Tabular Middle Atlas and the Saïs Basin at the Bittit Spring, which takes into account for both horizontal flows through stratification joints or karst and through subvertical fractures.

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“…It has been applied for investigating areas of complex geology, such as volcanic and geothermal areas (Di Maio et al, 1998), seismotectonic structures (Caputo et al, 2003;Nguyen et al, 2005), and areas affected by hydrogeologic phenomena and environmental problems (Ogilvy et al, 1999;Lapenna et al, 2005;Soupios et al, 2007;Georgaki et al, 2007;Naudet et al, 2008). It has been also used to locate cavities in the subsoil (El-Qady et al, 2005;Gibson et al, 2007;Crawford et al, 2007;Mitrofan et al, 2008;Soupios et al, 2008).…”

Section: Electrical Resistivity Tomography Techniquementioning

confidence: 99%

Near surface geophysics techniques and geomorphological approach to reconstruct the hazard cave map in historical and urban areas

Lazzari¹,

Loperte²,

Perrone³

2010

Adv. Geosci.

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Abstract. This work, carried out with an integrated methodological approach, focuses on the use of near surface geophysics techniques, such as ground penetrating radar and electrical resistivity tomography (ERT), and geomorphological analysis, in order to reconstruct the cave distribution and geometry in a urban context and, in particular, in historical centres. The interaction during recent centuries between human activity (caves excavation, birth and growth of an urban area) and the characters of the natural environment were the reasons of a progressive increase in hazard and vulnerability levels of several sites. The reconstruction of a detailed cave map distribution is the first step to define the anthropic and geomorphological hazard in urban areas, fundamental basis for planning and assessing the risk.

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Image processing of 2D resistivity data for imaging faults

Cited by 102 publications

References 29 publications

Geophysical investigation of landslides : a review

Geophysical investigation of landslides : a review

Geoelectrical Tomography Investigating and Modeling of Fractures Network around Bittit Spring (Middle Atlas, Morocco)

Near surface geophysics techniques and geomorphological approach to reconstruct the hazard cave map in historical and urban areas

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