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Authors: Gambetta, M.*
Armadillo, E.*
Carmisciano, C.*
Stefanelli, P.*
Cocchi, L.*
Caratori Tontini, F.*
Title: Determining geophysical properties of a nearsurface cave through integrated microgravity vertical gradient and electrical resistivity tomography measurements
Title of journal: Journal of Cave and Karst Studies
Series/Report no.: 1/73(2011)
Publisher: National Speleological Society
Issue Date: Apr-2011
DOI: 10.4311/jcks2009ex0091
Keywords: Gravity gradient
electrical tomography
karst aquifer
Abstract: Vertical-gradient microgravity and electrical-resistivity tomography geophysical surveys were performed over a shallow cave in the Italian Armetta Mountain karst area, close to the Liguria-Piedmont watershed. The aim of this study was to test the geophysical response of a known shallow cave. The shallowest portion of the cave exhibits narrow passages and, at about 30 meters below the entrance, a fossil meander linking two large chambers, the target of the geophysical survey. The integrated results of the two surveys show a clear geophysical response to the cave. The surveys exhibited high resistivity values and a negative gravity anomaly over the large cave passages. This work confirms the ability of these geophysical techniques to give the precise location of the voids, even in complex environments. The application of these techniques can be successful for site surveying where the presence of hollows may be expected.
Appears in Collections:05.08.02. Hydrogeological risk
04.03.04. Gravity anomalies
03.02.03. Groundwater processes
04.06.06. Surveys, measurements, and monitoring
Papers Published / Papers in press

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