296 



V. I. FOMINA 



and minus branches of the DQP in the absence of distortions from buried 

 contacts. This is not to be observed on the profiles under consideration, 

 owng to considerable distortions. 



In calculating the influence of distortions from buried contacts we make 

 use of the fact that the deviations Qj^ from {q^ f^)j^ are of reciprocal sign for 

 the plus and minus branches. 



12 3 5 



o(32al .MOW (d (d) le) S(fl ==(g) .--"-IM (■l==(i)-.. .(«} E IJ 



Fig. 18. a — DQP points; b — values of qi^; c — ^Unes of equal values of Qf^; d — lines of 

 equal values of O/j (variant); e — lines of equal values oi Qj^, the configuration of which 

 is conditioned by the influence of buried non -horizontal boimdaries;/ — the position 

 of the buried non -horizontal boundaries ; g — the Hne qj^ j^^jq of VEP curves of a horizon- 

 tally homogeneous medium ; h — lines of the maximum values of Qj^ relative to (g j i^j^ ; 

 i — hues of origin of the increase of g^jjjjjj relative to {q-^ ^)j^; j — Unes of maxima in 

 the increases of g;^ relative to (o, }^l', k — line of origin of the decrease of g^ relative 

 to (g»j Ji)i,'i I — regions of distortions of Qj^. 



We compile a single vertical cross-section of the plus and minus DQP 

 branches for surface inhomogeneities of the strata. In this case the abscissae 

 of the values of q^^ are laid off along the vertical lines from the central point 

 between the dipoles AB and MN. 



If the vertical cross -section is constructed in this way, the anomalous 



/ ^\ 



values of p^ I beginning with values of R close to — I will be found in a zone 



in which the Hne of the maximum deviations of Qj^ from {q-^ j^j^ is inclined 

 to the line of the profile at an angle the tangent of which equals the ratio 

 between the vertical and horizontal scales, while the line of origin of the 

 deviation of q^^ lies along the bisectrix of this angle. The values of Qi^ from 

 the various DQP branches will fail in varying degrees to coincide in this 

 region (Fig. 18). The line of origin of the distortions of Qf^ divides the vertical 

 cross-section into 5 regions in relation to the degree and direction of the 

 deviation of q,^, as follows: 



