THE LOOP METHOD IN EXPLORING BURIED STRUCTURES 



253 



anisotropy, the considerable thicknesses of the alluvia and the extremely 

 gentle angle of dip of the investigated rock led to an irregular distribution 

 of the vectors. However, on the background of even such a vector field it 

 was nevertheless possible to distinguish a number of sections, on which, 

 owing to a more regular disposition of the vectors, a probable presence of 

 anticlinal upfolds <i^) was proposed. To determine the actual nature of the 

 electrical anomaly on three of them, Annovskaia, Severnaia and Yuzhnaia 

 Tslaun'skaia between 1948 and 1949, observations were carried out Mdth 

 the vertical electrical probe method, confirming the data of the loop method. 



yvm ' 



Hi H2 [Z]3 



Fig. 5. Comparison of the structures of the Moshkarevka area according to the data 



of seismic prospecting and the loop method. 1 — structure contours; 2 — isonormals to 



the loop vectors; 3 — axis of folds determined from the electrical prospecting data; 



4 — number of seismic profiles. 



The Annovskaia and Gor'kovskaia upfolds were also proved by the geological 

 survey. 



On the southern edge of the Priazovskaia depression the variometric 

 survey and the loop method showed the Goncharovskaia (Karagozskaia) 

 structure, confirmed later by geological surveying by deep drilling and by 

 seismic explorations. 



