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Limiting apparent‐resistivity values for dipping‐bed earth models
Author(s) -
Hunt Paul,
Powell Nigel,
Watson Kathryn A.
Publication year - 2001
Publication title -
geophysical prospecting
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.735
H-Index - 79
eISSN - 1365-2478
pISSN - 0016-8025
DOI - 10.1046/j.1365-2478.2001.00281.x
Subject(s) - geology , electrical resistivity and conductivity , economic geology , earth (classical element) , limiting , regional geology , mineralogy , hydrogeology , geotechnical engineering , metamorphic petrology , mathematics , physics , mechanical engineering , engineering , mathematical physics , quantum mechanics
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.