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《Chinese Journal of Geophysics》 1990-01
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RECONSTRUCTION OF THE DISTRIBUTION OF RELATIVE ATTENUATIONS IN SUBSURFACE MEDIA: A NEW TOMOGRAPHIC TECHNIQUE

LlU LI-ZHEN(Beijing Computer Centre of MCMR, Beijing)  
In traditional continuous wave EM tomography (CWEMT or EMT, for short), it is often difficult, even impossible, to determine the transmitting power factor K of the source, which is a main paramater for the solution of the linear system of equations. As a result, the application of EMT becomes greatly limited. In this paper, a new EMT is presented, the linear system of equations of which is independent of K and can therefore work well where even the traditional technique failed. The image reconstructed by using the new technique is 2-D distribution of the relative attenuations in subsurface media, the resolution and stability of which seems to be better and to be more favourable to geological interpretation than that of absolute attenuations reconstructed by using the traditional one. The new technique has successfully been used in data processing for underground EM w?.ve shadowing in eight different areas.
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