Seismicity of central part of Ukrainian shield in 2007 - 2013 period

2014;
: pp. 144-158
1
Subbotin Institute of geophysics of National Academy of Sciences of Ukraine
2
S. I. Subbotin Institute of Geophysics of the National Academy of Sciences of Ukraine
3
The main center of special control of NSAU
4
Subbotin Institute of Geophysics of National Academy of Sciences of Ukraine
5
Subbotin Institute of geophysics of National Academy of Sciences of Ukraine

Purpose. To perform a comparative analysis of record forms and earthquake spectrograms and explosions in quarries and mines what located in area of Kriviy Rih iron-ore basin (Kryvbas) for detection of seismic event signs of different nature this region with magnitude Mb ≥ 3,0 is the research object. Methods. On based the scientific literature the questions of the influence of external factors to the origin of local earthquakes on the platform territory in West-Ingulets-Kryvoyrih-Kremenchug sutural zone which is the source of seismicity in the central part of the Ukrainian Shield are analyzed. The analysis and synthesis of accumulated until 2009 to 2013 of the Institute of Geophysics of NAS of Ukraine and the Main center of special control information about local seismic events in area of Kriviy Rih city for to determine the nature ones are realized. The tectonic features of Earth's crust structure of central part of the Ukrainian shield on the results of geological and geophysical studies and boring Kriviy Rih super-deep borehole NG-8 are considered. Results. It is shown that the records of earthquakes December 25, 2007, January 14, 2011 and June 23, 2013 are similar and have several signs that different ones from explosion records. When comparing seismograms and spectrograms of this three seismic events it was detected only a small difference in the amplitude of the LR-wave in the NS-component that possibly caused by the different depth of their sources. Scientific novelty. The determined signs of seismic events of different nature allow selecting of tectonic earthquakes on the background of technogenetic and seismic events of technogenetic-natural nature. The practical significance. Preliminary results show that as the primary steps necessary to provide immediate development of a monitoring network of seismic observations that can be of teleseismic methods to localize areas of modern activation of tectonic structures that accompanied by earthquakes of varying magnitude and seismic emission. This created network allows to carry out special measures to stabilize the geological environment and to develop the scientific-based methods for extracting iron ore and to be safe their efficiency and profitability that will allow minimize future catastrophic consequences from a disturbance of ecological and geological conditions.

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