he article deals with a model of the fault tectonics of the Ukhta fold in the Timan Ridge, created on the basis of reinterpretation of seismic data. By the results of constructions along the top of the Upper Proterozoic basement, the majority of the faults have a northwestern direction and extend both continuously and fragmentarily throughout the entire structure. Only north-west-directed faults are clearly traced over the surface of the Devonian deposits. The overlay of the obtained scheme onto the map of the anomalous magnetic field indicates that the identified faults are normally missed in the magnetic field when surveying at a scale of 1:50 000. For the detail site location of the faults and the continuous research of the geodynamic situation, a complex of field geophysical works is required to be conducted in the future.

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In this paper we discuss results of complex geophysical works within the southern and middle segments of the West Timan fault. In the study area, based on the nature of potential fields (magnetic, gravitational), various areas of the West Timan fault were identified: the southern part (Beloborsk block), the central part (Nivshera block), and the northern part (Sindor block). These areas were studied by profile magnetometry on foot and express radon survey. The detailed magnetic survey revealed that the West Timan fault was clearly visible in the gradient sections of the magnetic field, with some degree of conventionality it can be identified within the regional maximum, and it is impossible to trace it in the zone of the regional minimum. Based on the interpretation of seismic data, the location of the West Timan fault has been clarified. The nature of the seismic record does not always allow identifying the exact location of the fold planes, only the difference in the record in individual blocks is clearly noted. The border area sometimes captures 5 km. The express emanation survey showed that the West Timan thrust, in general, was characterized by increased values of radon volumetric activity, where they are further traced to the territory of Timan, while areas of different intensity are distinguished.