Analysis of natural and technogenic factors on the seismicity of Kryvyi Rih

Abstract

Information is provided on the number of earthquakes in Kryvyi Rih and their parameters for the period 2007–2018. The types of seismic phenomena, the criteria for their identification are considered. The most probable natural and technogenic factors of the epicenters of local earthquakes are established by analyzing their location and sequence in time from the point of view of the tectonic features of the territory and the nature of the technogenic interference in its structure. The necessity of creating a local seismological network in Kryvyi Rih is substantiated. With a view to predict hazardous seismic phenomena, there is a need to continue hydrogeodynamic monitoring of ground water, to introduce seismic gravity monitoring and to conduct microseismic monitoring at mining enterprises. The results of systematic monitoring shall serve as the basis for seismic microzoning of the city. It is emphasized that popularization and dissemination of knowledge about the seismicity of mining regions among the population shall play an important role in the implementation of this task. The research materials can be used in the master’s degree programme within the framework of higher education system and in advanced training of specialists in the mining industry.

Connection of Kryvbas tectonics with natural and technogenic seismicity

“…We determined the linear extension of the Kryvyi RihKremenchuk structuralfacies zone for hundreds of kilo meters. The fault is traced through the entire crust according to the displacement of seismic reflective elements [8,10] and extends for 200 or more kilometers in the north and south di rections outside the USH and has a western dip. Its angles of incidence near the surface of the crystalline foundation have an inclination of 75-80° and are more gentle in the lower part of the crust -up to 45-55°.…”

“…In the Kryvbas region, the sublatitudinal system of faults is represented by faults with a direction of 285-295°, which has an almost vertical dip (75-90°) [4,8]. Fig.…”

“…Previous studies have established [5,6] that the main seismic effect is not created by the explosions in the mine themselves, but by their consequences -crushing and dis placement of rocks or spontaneous subsidence of the soil in tectonic zones. At the same time, their geolocation went be yond the territory of iron ore mining [7,8]. The analysis of their distribution shows the presence of activation of discon tinuous faults of different directions and depth of layers [4].…”

“…Literature review. Earthquakes in the city of Kryvyi Rih, during which the intensity of shaking of the earth's surface in the epicenter was 5-6 points on the MSK64 scale, occurred on December 25, 2007 (mb = 3.9) [6,8], January 14, 2011 (mb = 3.8), June 23, 2013 (mb = 4.6) and July 29, 2017 (mb = = 4.1) [4.8]. The occurrence of earthquake foci in the zone of the Kryvyi Rih-Kremenchuk fault of the Ukrainian Shield [9,10] is probably a consequence of the uneven distribution of stresses on the border of the Inhul and Middle Dnipro mega blocks of the USH [11], as well as violations of the geodynam ic balance caused by powerful explosions during surface and underground mining of minerals and movements of large masses of the geological environment [12].…”

XII International Conference on Mathematics, Science and Technology Education: conference report

“…The article "Analysis of natural and technogenic factors on the seismicity of Kryvyi Rih" [41] of Petro G. Pihulevskyi et al provide the information on the number of earthquakes in Kryvyi Rih and their parameters for the period 2007-2018. The types of seismic phenomena, the criteria for their identification are considered.…”