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Diffraction geotomography is the technique for reconstructing the image of subsurface geological structures. This study was accomplished by this technique for effectively delineating geological objects. Filtered backpropagation alogrithm(FBPG) was applied to several models which are geological stratified layer model, dip model and complex model in crosshole and VSP transimetter-receiver arrays. Results are followed. 1) Optimum frequency for best delieneating objects was 1/2 wavelength =1 unit length of object. 2) In stratfied layer model, resolution of it in VSP array was very low relative to other models. Also diffraction geotomography using VSP array was not good in this model. 3) Resolution of the low velocity zone(LVZ) was very good. Also by this method it is possible to accurately detect and to quantitatively analyze the LVZ being meaningful in geology.
The present paper deals with the effect on mise-a`-la-masse and apparent resistivity anomalies of varying the position of current earthing electrode within the body and increasing the contrast in conductivity between the conductor and surrounding medium. Mise-a`-la-masse anomalies for bodies with three different orientations (dipping at 0,45,90 degrees)are measured by dipole-dipole electrode configurations in which both the distant current earthing electrode and one of the potential electrodes are fixed at each end of measuring lines. By using the measured potential normalized by the input current, apparent resistivities are calculated. Both Mise-a`-la-masse and apparent resistivity anomalies are contoured in plan-view. The position of the electrode within the conductor considerably affects the apparent resistivity anomaly patterns, but it does hardly affect the Mise-a`-la-masse anomaly patterns. The conductivity contrast does not affect any anomaly pattern except the case of vertical body. These experimental results are useful in quantitative interpretations about the size, shape, dip of the bodies by using together both the anomaly patterns in terms of correlations.