242 1. 1. Krolenko 



coefficient of anisotropy of the rocks A = "1 / -^ and the angle of inclination 



V- 



(X of the studied deposits. In the case of sufficiently homogeneous deposits 

 (A = const.) the observed values, proportional to the e.m.f. with respect 

 to the modulus and direction, characterize the change in a along a certain 

 profile, i.e. the tectonics of the studied deposits. 



The coefficient of mutual induction between the feed and receiving loops 

 can be changed either by deformation of the wire AB or by means of an 

 induction coil. 



The value of deformation of the wire, i.e. the area of the constructed 

 triangle of compensation a>, in relation to the area of the whole receiving 

 loop Q, gives a component of the vector of the loop measured for a given 



. ft) . 



position AB. The ratio -q is usually small; it is therefore multiplied by 



1000 and designated by / = -^ 1000. 



Thus with observations employing two mutually perpendicular lines 

 AB, the vector loop is measured. The position of this vector which shows 

 the direction of propagation of the current at a given point, i.e. the dip 

 direction of the rocks being studied. By analysing the vector distribution, 

 it is easy to indicate the position of the anticlinal and synclinal hinges. Thus 

 in terms of the isolines, drawn perpendicular to vectors, the upfolds, their 

 sub -divisions, regions of depression, etc. can be mapped. 



This method of interpreting observations, made "with the aid of a loop, 

 gives a general idea of the structure of the studied area. The method should, 

 therefore, be recommended in reconnaissance or semi-quaUtative surveys, 

 and also in the prehminary processing of data. 



The observations made in order to obtain details of the structure of a studied 

 feature, should be processed by the integration method. For this purpose, 

 sections intended for detailing should have connecting profiles of the 

 vectors intersecting the basic profiles. This system of profiles forms a closed 

 polygon, in which the integration of vectors can be carried out by the generally 

 known method. 



The advantages of the mathematical construction of isolines was shown 

 at a number of areas of the Kerch peninsula, Stepnyi Krym* and Turkmenia, 

 where considerable details of their structure were shown. This makes it 

 possible to recommend this form of interpretation for wider use when 

 processing observations by the loop method. An example of comparison 

 of both methods of interpretation is given in Fig. 1. To indicate the importance 



* The Crimean Steppes [Editor's note]. 



