The relaxation algorithm of the selected coordinate descent has been developing to control the underground seismic structure beneath the industrial subjects. The distinctive feature of the algorithm is in the interdisciplinary approach to choose nonzero components of the starting point. Application of the algorithm to seismic data recorded in complex geological conditions has shown an improvement in statistics characterizing the accuracy of the inversion solution. Based on seismic images, we have studied the cause of the 1976 Kopasker earthquake in northeastern Iceland. We concluded that the drilling of production geothermal wells was hardly the main factor provoking this event in the region. For the planning of fuel energy subjects, the following result might be using. The location of the earthquake epicenter is at the boundary between two contrasts: high and low seismic velocity areas.