3D geoelectric tomography and archaeological applications1
Article first published online: 9 AUG 2006
Volume 46, Issue 5, pages 543–570, September 1998
How to Cite
Mauriello, P., Monna, D. and Patella, D. (1998), 3D geoelectric tomography and archaeological applications. Geophysical Prospecting, 46: 543–570. doi: 10.1046/j.1365-2478.1998.00102.x
- Issue published online: 9 AUG 2006
- Article first published online: 9 AUG 2006
Following a previous paper in which the principles of a 3D ground-surface tomographic processing of self-potential data were established, we extend the method to active source geoelectric surveying. The main purpose of the new tomographic approach is to obtain a physical image reconstruction of the induced electric charges distributed over buried resistivity discontinuities. The information is produced in a probabilistic sense, as the mathematical formulation underlying the method treats only the intrinsic physical nature of the generated electric field underground and the method of its ground-surface detection, independently of the geometry of the unknown structures. In practice, a 3D tomography is realized by cross-correlating a set of distributed electric-field ground-surface data with a scanning function, representing a unit positive point charge located anywhere in the lower half-space. The resolution of the method is tested on the synthetic response of a 3D structural simulation of an archaeological target, consisting of an infinitely resistive prismatic body immersed in a half-space, including surface inhomogeneities and layering. Finally, the field response of a 3D structure consisting of a hypogeal dromos-chamber tomb inside the Sabine Necropolis at Colle del Forno, close to Rome, is presented and discussed.