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Removal of Topographic Effects in IP Method Complex Image Approach


Mester Sitepu


Vol. 11  No. 3  pp. 188-196


Using the method of complex image, the of topographic effect can be approximated based on the wave propagation patterns: surface to surface, surface to air and surface to subsurface. For a homogeneous medium with topography, it was shown that for a traverse over a hill a negative apparent resistivity anomaly is obtained while the transmitter is lying and fixed on the foothill and the receiver is moving along the traverse crossing the hill. For the same method, a traverse over a valley will result in a positive apparent resistivity anomaly. If the transmitter and the receiver are moving together at the same direction and keeping the separation distance between them constant an anomaly occurs only along the traverse where the source of anomaly is existing between the transmitter and the receiver. If the source of anomaly is an intersection between the horizontal plane and a sloping up plane, the shape of anomaly is similar to a wavelet. In this case the negative anomaly is associated with the confined current at the intersection and the positive anomaly is caused by the sparse current beyond the intersection. Using the method of complex images, the effects of topography is determinable. Thus using the method of image, the effect of topography is removable from the field data.


electromagnetic coupling, mutual impedance, complex image, apparent resistivity, topographic effect, anomaly