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A GENERALIZED CAGNIARD GRAPH FOR THE INTERPRETATION OF GEOELECTRICAL SOUNDING DATA
Author(s) -
KOEFOED O.
Publication year - 1960
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 - 10.1111/j.1365-2478.1960.tb01728.x
Subject(s) - depth sounding , electrical resistivity and conductivity , geology , graph , vertical electrical sounding , igneous petrology , interpretation (philosophy) , gemology , geophysics , mineralogy , engineering geology , mathematics , geotechnical engineering , computer science , seismology , physics , volcanism , oceanography , discrete mathematics , quantum mechanics , aquifer , groundwater , tectonics , programming language
A bstract The Cagniard method of interpreting geoelectrical sounding data is based on the use of an empirical graph which expresses the relation between the resistivity and thickness of the second subsurface layer on one side, and on the other side the replacement resistivity and replacement thickness which are derived from the two‐layer sounding curve which is asymptotic to the second branch of the observed sounding curve. In his method separate graphs of this type are required for different values of the resistivity of the third subsurface layer. In the present paper a generalized Cagniard graph is derived which has the advantage of being independent of the value of the resistivity of the third subsurface layer. Finally, the accuracy of the method is discussed, and a procedure is described for extending its use to cases where more than three subsurface layers intervene.