A GRAVIMETRIC 3D GLOBAL INVERSION FOR CAVITY DETECTION

Citation
Ag. Camacho et al., A GRAVIMETRIC 3D GLOBAL INVERSION FOR CAVITY DETECTION, Geophysical prospecting, 42(2), 1994, pp. 113-130
Citations number
17
Categorie Soggetti
Geosciences, Interdisciplinary
Journal title
ISSN journal
00168025
Volume
42
Issue
2
Year of publication
1994
Pages
113 - 130
Database
ISI
SICI code
0016-8025(1994)42:2<113:AG3GIF>2.0.ZU;2-Q
Abstract
A gravimetric survey, covering a site 200 m square, was carried out in order to locate karstic cavities. After eliminating the regional tren d using a polynomial fit, the residual is modelled by least-squares pr ediction. Correlated signals for several wavelengths are detected. The inversion of these anomalies is performed by a global 3D adjustment u sing spherical bodies as models. The adjustment is repeated in order t o obtain a stable configuration. The results show the probable presenc e of a system of cavities and galleries. Data collected from boreholes and the subsequent appearance of sink-holes are consistent with the r esults.