Determining Geophysical Properties of a Near-Surface Cave through Integrated Microgravity Vertical Gradient and Electrical Resistivity Tomography Measurements

Gambetta, M.; Armadillo, Egidio; Carmisciano, C.; Stefanelli, P.; Cocchi, L.; Tontini, F. Caratori

doi:10.4311/jcks2009ex0091

Cited by 43 publications

(21 citation statements)

References 5 publications

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“…It is increasingly used in environmental studies, hydrogeology (Maillet et al 2005;Š umanovac, 2006;Martínez et al, 2009), and geotechnics (Naudet et al, 2008), among other fields. This technique has also been used for detection of natural crevice-type caves (van Schoor, 2002;Gutiérrez et al, 2009;Pá nek et al, 2010;Gambetta et al, 2011) and in some cases, to locate manmade mining cavities (Maillol et al, 1999;Martínez-Ló pez et al, 2007).…”

Section: Introductionmentioning

confidence: 99%

Electrical Tomography Applied to the Detection of Subsurface Cavities

Martines-López¹,

Rey²,

Dueñas³

et al. 2013

JCKS

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Abstract:We have analyzed the geoelectric response produced by three cavities cut into different geological substrata of granite, phyllite, and sandstone that had previously been characterized by direct methods. We also examined a mining void excavated in granite. In each case, we applied three different geoelectric arrays (Wenner-Schlumberger, Wenner and dipole-dipole) and several inter-electrode spacings. The survey results suggest that electrical resistivity tomography is a viable geophysical tool for the detection and monitoring of mining voids and other subsurface cavities. The results vary depending on a wide range of factors, such as the depth and diameter of the cavity, the multi-electrode array used, the inter-electrode spacing, the geological model, and the density of the data. The resolution capacity of the Wenner-Schlumberger array for the detection of these cavities was greater than that of the Wenner array and slightly better than the dipole-dipole. There is a direct relationship between inter-electrode spacing and diameter of the cavity. In general, we observed a loss of resolution as the distance between the electrodes increased. The most efficient detection was achieved when the inter-electrodes distance was less than or equal to the diameter of the cavity itself. In addition, cavity detection became increasingly less precise with its depth beneath the surface. Cavities with a radius of about 1.5 m were located by both the WennerSchlumberger method and the dipole-dipole at depths of more than 4.6 m, which means that prospecting can be carried out at depths 3 times the radius of the cavity.

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Section: Introductionmentioning

confidence: 99%

Electrical Tomography Applied to the Detection of Subsurface Cavities

Martines-López¹,

Rey²,

Dueñas³

et al. 2013

JCKS

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“…It can be used in various applications such as in detecting underground water and cavities, faults, and cracks [1][2][3][4][5][6][7]. Generally, ERS is performed by installing an electrode made of a conductive material.…”

Section: Introductionmentioning

confidence: 99%

“…Thus, it was shown that ERS is applicable to cement mortar grouted locations. Gambetta et al [6] observed the geophysical response of a shallow cave by using PEM. The results showed clear geophysical responses of large cave passages by high electrical resistivity.…”

Section: Introductionmentioning

confidence: 99%

Experimental Study on Electrode Method for Electrical Resistivity Survey to Detect Cavities under Road Pavements

et al. 2017

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There are two types of electrode methods for electrical resistivity survey (ERS): the pole electrode method (PEM) and flat electrode method (FEM). During the past few decades, most studies were conducted by using PEM for various purposes while only a few were conducted by using FEM. Laboratory and field experiments were performed in this study to investigate the advantage of FEM in detecting cavities under pavements. In the laboratory experiment, the results of PEM and FEM were compared graphically and statistically. A significant difference between the results of PEM and FEM was observed for concrete at an age of seven days, while there was no significant difference in the results for soil materials. Electrical resistivity could not be obtained from asphalt because it is an insulator. In a field experiment, four different cases were simulated: field ground with/without cavity and concrete pavement with/without cavity. The results of PEM and FEM for these cases were compared using 2D electrical resistivity contour images. It was observed that the distribution of electrical resistivity obtained using FEM was wider than that using PEM. Moreover, the locations of the cavities artificially made in the ground and under the pavement were accurately detected using both PEM and FEM.

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“…In scientific literature, many papers report on the successful application of geophysical prospecting for the detection of natural cavities: Gibson et al (2004), Leucci et al (2004), Mochales et al (2008), Kaufmann et al (2011), Gambetta et al (2011), Gó mez-Ortiz and Martín-Crespo (2012) and Pueyo Anchuela et al (2013). This is probably because natural cavities are often isolated, with a high contrast between their physical parameters and those of the host material.…”

Section: Introductionmentioning

confidence: 99%

Integrated Analysis of Geological and Geophysical Data for the Detection of Man-made Underground Caves in an area in Southern Italy

Negri¹,

Margiotta²,

Quarta³

et al. 2015

JCKS

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In Cutrofiano, in the southern part of the Salento Peninsula, Apulia, Italy, a Pleistocene calcarenitic sequence was quarried by digging extensive networks of galleries along the geological succession most suitable for the quarrying activity. These caves represent a potential hazard for the built-up environment due to the occurrence of underground instability that may propagate upward and eventually reach the surface, causing sinkholes. In this work we propose integrated interdisciplinary methods for cavities detection. The methodology was applied at a test area located along a major road near Cutrofiano using geological and electrical-resistivity tomography and microgravity geophysical methods.

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Determining Geophysical Properties of a Near-Surface Cave through Integrated Microgravity Vertical Gradient and Electrical Resistivity Tomography Measurements

Cited by 43 publications

References 5 publications

Electrical Tomography Applied to the Detection of Subsurface Cavities

Electrical Tomography Applied to the Detection of Subsurface Cavities

Experimental Study on Electrode Method for Electrical Resistivity Survey to Detect Cavities under Road Pavements

Integrated Analysis of Geological and Geophysical Data for the Detection of Man-made Underground Caves in an area in Southern Italy

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