Limiting apparent-resistivity values for dipping-bed earth models |
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Authors: | Paul Hunt Nigel Powell Kathryn A. Watson |
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Affiliation: | University of Exeter, Camborne School of Mines, Redruth, Cornwall TR15 3SE, and;STATS (St Albans Technical Services), Porterswood House, St Albans, Hertfordshire, UK |
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Abstract: | Consideration is given to some special features of normalized apparent-resistivity (NAR) curves, resulting from the deployment of Wenner electrode arrays on the surface above dipping earth structures. Limiting values of the potential are derived when a direct-current source is located at points on the surface above a simple two-region dipping-bed earth model and their influence on corresponding NAR curve characteristics is investigated. Particular attention is given to the exploitation of such features to provide a new and direct approach to model parameter estimation, either as an alternative to traditional curve-matching techniques or as a source of supporting information when other earth model characterization methods have been employed. Throughout, the emphasis is on the single-dipping-bed model, but application to more complex structures is discussed, including examples of two dipping beds, dipping dikes and more general tilted unconformities. |
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