High-resolution geoelectrical tomographies in the study of Giarrossa landslide (southern Italy)

Lapenna, Vincenzo; Lorenzo, P.; Perrone, Angela; Piscitelli, S.; Sdao, Francesco; Rizzo, Enzo

doi:10.1007/s10064-002-0184-z

Cited by 110 publications

(47 citation statements)

References 20 publications

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“…The fundamental frequency was derived from the H/V curves and used for deriving an estimate of the rupture surface depth. Depending on the studied case, these estimations were successfully compared with electrical measurements [Lapenna et al, 2003] or with geotechnical soundings or borehole measurements [Méric et al, this issue]. This easy to perform survey opens interesting perspectives for 3D investigation, with the limit of strong 2D or 3D effects which can disturb the propagation of surface waves.…”

Section: Seismic Noise Measurements (H/v Method)mentioning

confidence: 99%

Geophysical investigation of landslides : a review

Jongmans

Garambois

2007

Bulletin De La Société Géologique De France

308

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: Seismic Noise Measurements (H/v Method)mentioning

confidence: 99%

Geophysical investigation of landslides : a review

Jongmans

Garambois

2007

Bulletin De La Société Géologique De France

308

176

View full text Add to dashboard Cite

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“…DC resistivity and electromagnetic and GRP geophysical survey were conducted around the Machu Picchu landslide, Peru (Best et al 2009). Electrical resistivity tomography is commonly used for landslide monitoring (Suzuki and Higashi 2001;Lapenna et al 2003;Friedel et al 2006). However, not all these methods can be applied in each case, especially in places where the slope is perpetually unstable.…”

Section: Introductionmentioning

confidence: 99%

Integrated very low-frequency EM, electrical resistivity, and geological studies on the Lanta Khola landslide, North Sikkim, India

et al. 2009

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Landslides are very common in high-altitude Himalayan terrains. Major roads in the Himalayas are frequently blocked due to heavy landslides and remain closed for long periods of time. Permanent mitigatory solutions to these landslides are required to keep the highways open. Lanta Khola, located 71.2 km north of Gangtok (capital of the Indian state of Sikkim), is one of the oldest landslides on the North Sikkim Highway and is active since 1975. The rock types on either side of the landslide are different (augen gneiss in the east and metapelitic schist in the west), and it is believed that the Main Central Thrust passes through the slide zone. Since the slide is invariably activated in the aftermath of heavy rainfall, it is important to identify the subsurface structures that channel water below the landslide surface in order to understand the triggers of slide activity. This can only be accomplished by geophysical survey; however, an appropriate geophysical technique that can be applied in such terrains must be identified. Very low-frequency (VLF) electromagnetic survey was performed over the Lanta Khola landside in order to delineate subsurface structures. Although a very limited number of VLF transmitters are available worldwide, it was possible to pick up VLF signals from a number of VLF stations even in this highaltitude mountainous terrain. VLF measurements along five profiles perpendicular to the geological strike were recorded, and a high conducting zone was delineated from the VLF observations. This conducting zone correlates with the low resistive zone identified from gradient resistivity profiling. The anomalies confirm that there is a water-saturated zone (soggy zone) even in the subsurface of the slide parallel to the geological gneiss-schist contact within the Lanta Khola slide. This indicates that the conductive feature correlates with a weak water-saturated debris layer that lies along the slide and is parallel to the geological contact. Resistive structures on either side of the landslide zone can thus be correlated with the stable ground. It is necessary to drain out water from the soggy zone to minimize slide activity since this zone appears to penetrate into the body of the slide.

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“…It has received increasing attention in recent years, in particular for shallow landslide characterization (Benderitter and Schott, 1999;Godio and Bottino, 2001;Lapenna et al, 2003;Bichler et al, 2004;Lebourg et al, 2005). This attention is mainly linked to the effi ciency of the method in detecting interstitial water in the ground (McGrath et al, 2002;Garambois et al, 2002;Jomard et al, 2007a;Jomard et al, 2007b).…”

Section: Introductionmentioning

confidence: 97%

Electrical imaging of sliding geometry and fluids associated with a deep seated landslide (La Clapière, France)

Jomard

Lebourg

Guglielmi

et al. 2010

Earth Surf Processes Landf

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International audienceThis paper deals with the applicability of electrical resistivity tomography (ERT) for the recognition of large landslide structures at depths, which have never previously been imaged accurately. One of the most studied and instrumented deep landslides in Europe is taken as an example: the La Clapière landslide. The first stage of the study consisted of an accurate geological mapping taking into account a morphological analysis of gravitational deformations. This allowed a very fine definition of the landslide structure, that could be compared with three provided ERT profiles performed within the landslide body. Very good correlations were obtained for the determination of sub-horizontal structures and associated fluid circulations. It confirmed the position of the sliding surface that reached a maximum depth of 100 m. Forward computing was however necessary to determine the influence and then the presence of vertical discontinuities. It supports the use of ERT as an efficient tool for large scale landslide imaging, such as deep seated landslides. Copyright © 2010 John Wiley & Sons, Ltd

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High-resolution geoelectrical tomographies in the study of Giarrossa landslide (southern Italy)

Cited by 110 publications

References 20 publications

Geophysical investigation of landslides : a review

Geophysical investigation of landslides : a review

Integrated very low-frequency EM, electrical resistivity, and geological studies on the Lanta Khola landslide, North Sikkim, India

Electrical imaging of sliding geometry and fluids associated with a deep seated landslide (La Clapière, France)

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