Chap. 10] 



ELECTRICAL METHODS 



727 



E. Interpretation 



Interpretation of data, obtained with resistivity mapping or resistivity 

 sounding, may be made (1) qualitatively (using the appearance of the 

 curves); (2) quantitatively, by analytical interpretation methods; (3) 



Fig. 10-626. Tagg interpretation diagram {k positive). 



quantitatively, using "type" curves calculated for given conditions; (4) 

 with the help of model experiments. 



1. Qualitative methods. Qualitative interpretation has a definite place 

 in resistivity mapping. High apparent resistivities indicate the presence 

 of bodies or formations of high resistivity within the depth range and 



