Contrasting resistivity, temperature, pressure, porosity and fluid migrations are the main causes of ion accumulations along the discontinuities which create coupling-induced natural current flow which is observed as the Natural Polarization Potential (NPP) on the surface. Natural Polarization Electric Field (NPE) variations were recorded along 13 profiles about 2.5 km each in a north-south direction. Interpretation of the coincident anomalies of the N P P and the NPE field resulted in determination of the polarization angle, polarization focal depth and the azimuths of the polarized interfaces. Considerable agreement between faults delineated by previous geological and geophysical investigations and polarization discontinuities was observed. The polarization plane was observed to be horizontal in high temperature areas but steepened gradually in relatively colder regions in the northern coastal area. From the polarization depth distribution two depression zones were observed, separated by an uplifted section elongated in a north-south direction. The basin at the eastern side had an estimated polarization depth of 1.1 km and was limited by the Agamemnon-2 and -1 faults, while the western basin had an estimated depth of 1.3 km and extended in the eastwest direction not previously reported. The eastern basin extends on the north side around the town of Inciralti, the western basin appeared to be elongated towards the town of Cesme.
ERCAN, A. 1980, Quasi-analytic Convolution Solution of the Electromagnetic Field, Geophysical Prospecting 29, 89-101.The objective of this study is to generate the separation-distance-domain (r-domain) transformation of the theoretically calculated wave number domain (m-domain) electromagnetic induction field component B,(m, U ) of a stratified medium and to search for interpretive information which has been absent in the previously achieved numerical solutions of the problem.The r-domain kernel &, w ) function defining the induction field appears to adequately reflect the layering and electrical properties of the medium if it is expressed as a function of the frequency if the source-receiver separation r is small with respect to the thickness of the first layer. However, exact values of the conductivity cannot be distinguished from those of the neighboring values unless a resistive basement layer is present. This feature is the result of the truncation in series representation of the kernel function R(m, w ) . However, this truncation is regarded as significant in the case of a conductive first layer. In m-domain static-zone studies, a conductive first layer slightly influences its u-domain correspondent.Although the computational cost of obtaining the kernel B(r, w ) by evaluation of the convolution in a cylindrical coordinate system is high, this semi-analytic solution is still superior to those based on the asymptotic assumptions. I N T R O D U C T I O NAn oscillating horizontal electric dipole of current moment I dl located at z = 0 and Y = 0 and oriented in the x-direction over a homogeneous anisotropic horizontally layered half-space is considered. A cylindrical coordinate system is used (r, 4, z). The half space z > 0 is assumed to be free space with dielectric constant z0 and magnetic permeability ,uo . The dipole is of length dl and carries a current I exp (icot), where co is the angular frequency and t is *
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