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Technical Papers - Airborne Electromagnetics
Using a Non-Integer Moment of the Impulse Response to Estimate the Halfspace Conductivity
Terry J. Lee, Richard S. Smith, Fugro Airborne Surveys, Ottawa, Christophe S. B. Hyde.
Abstract
The nth order moments of the electromagnetic impulse response are useful for interpreting electromagnetic data. We have derived an analytic expression for the half-order moment of a conductive halfspace. By inverting this expression, the measured half-order moment can be used to estimate an apparent conductivity of the ground. The first-order moment can also be used to estimate the halfspace conductivity. A sensitivity analysis indicates that for an airborne EM configuration, the half-order moment will be most sensitive to material in the top 26 to 48 m while the first-order moment will be sensitive to deeper material (down to depths between 66 and 127 m).
Published in Geophysical Prospecting, September, 2003, Volume 51, pages 443-446. © 2003 European Association of Geoscientists & Engineers. Single copies of the article may be printed for personal reference, but the article may not be reproduced in paper for bulk copies. Reprint copies must be purchased from Blackwell Science. For more information on Geophysical Prospecting see the Blackwell Science website.
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