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A gravimetric 3D Global inversion for cavity detection1
- Source: Geophysical Prospecting, Volume 42, Issue 2, Feb 1994, p. 113 - 130
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- 27 Apr 2006
Abstract
Abstract
A gravimetric survey, covering a site 200 m square, was carried out in order to locate karstic cavities. After eliminating the regional trend using a polynomial fit, the residual is modelled by least‐squares prediction. Correlated signals for several wavelengths are detected. The inversion of these anomalies is performed by a global 3D adjustment using spherical bodies as models. The adjustment is repeated in order to obtain a stable configuration. The results show the probable presence of a system of cavities and galleries. Data collected from boreholes and the subsequent appearance of sink‐holes are consistent with the results.