PARAMETER SENSITIVITY MAPS OF SURFACE GEOELECTRIC ARRAYS udII. NONLINEAR AND FOCUSSED ARRAYS

摘要

In this paper we present, at first time in a geophysical journal, parameter sensitivityudmaps of nonlinear and focussed electrode arrays. We present them as anomaliesuddue to electric dipoles forming on opposing surfaces of an elementary cube within theudsubsurface at three different depths, and not only the total effect of the dipole, butudalso of its components are shown. Parameter sensitivity maps of non-linear arrays,udcompared to those of linear arrays, have in general 1. more equal sensitivity valuesudin x and y directions, 2. more chances for antisymmetry axes, 3. smoother lateraluddistribution of sensitivity values. We recommend a systematic use of parameter sensitivityudmaps in geoelectric prospecting, both in planning and interpretation of fieldudmeasurements.