Model studies on electro-telluric interpretation problems of some geological inhomogeneities |
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Authors: | K K Roy |
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Institution: | (1) Department of Geology and Geophysics, Indian Institute of Technology, Kharagpur, India |
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Abstract: | Summary The rotating nature of telluric field is simulated in an electrolytic model tank. Variations of this rotating field due to the presence of a few two and three dimensional geological models, simulated in the tank, are studied. The telluric ellipses, recorded on a C.R.O. Screen, are found to be useful for qualitative and quantitative interpretation of the non-linearly polarised telluric field data. Relative usefulnesses of the various parameters, e.g., (i)M=ratio of the semimajor and semiminor axis, (ii)K = square root of normalized surface areas, (iii) = linear eccentricity ( (a
2/b
2-1) and (iv)e = conventional eccentricity (( 1-b
2/a
2)), of a telluric ellipse are tested. Linear eccentricity appears to be the most sensitive parameter. Methods for determining depth and horizontal extent of a structure from a telluric map are suggested. Near surface inhomogeneities, as revealed from the experiment are unlikely to affect the telluric map due to a basement structure. |
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