Forecasting of subsidence of the earth’s surface within the salt deposits areas of Precarpathians by a complex of geophysical and geodetic studies

The work presents the proof of the efficiency of complex research of the area of exhaust salt deposits by geophysical and surveying methods. As a research site a western part of the Stebnik deposit was selected, and the method of natural pulsed electromagnetic field of the earth (NPEMFE) was considered among geophysical methods. The use of the NPEMFE complex and geodetic surveys seems appropriate in terms of identifying the existing deformations of the earth’s surface and the forecast of their development at the primary stage of assessing the danger of sediments and landslides. The projection of plane anomalies of NPEMFE in the analysis of their gradation according to intensity allows to specify the stage of subsidence of the earth’s surface, including determining the territory before the initial stage, when underground deformations of the rock mass are already occurring, but not yet reflected on the surface. In this sense, the method is predictable. The research presents for the first time a thorough analysis of the dynamic of subsidence during considerable period of the time and a quantitative statistical assessment of the connection with the data of the NPEMFE, which allows not only to constant the fact of a dangerous condition of the geological environment, but to make predictive conclusions about the development of the situation.