Abstract
The departure from the perfectly geometrical shape of the conducting body substantially changes its electromagnetic response. The interpretations regarding the dispositions of the body assuming an underformed shape have to be suitably modified if it is in reality deformed.The quantitative contribution of small deformation has been obtained using a perturbation technique. Both global and small-scale conducting structures, employing spherical and cylindrical models respectively, have been considered. Numerical computations have been made to find the depth estimate of the first major conductivity discontinuity in the Earth, when its boundary is assumed to be perturbed. The results have application in the interpretation of anomalies in the geomagnetic variations.
