SPATIAL RHYTHMS IN THE DATA OF SUPER-DEEP BOREHOLES
Schmidt Institute of Physics of the Earth, Russian Academy of Sciences, Russia, 123242, Moscow, Bolshaya Gruzinskaya st., 10-1
Journal: Science and technological developments
Keywords: SPECTRAL-PROFILE ANALYSIS, SEISMOACOUSTIC MODEL OF GEOLOGICAL SECTION, WAVELET ANALYSIS, BLOCK STRUCTURE OF THE EARTH'S CRUST
Аnnotation: This work is a continuation of the study of spatial rhythmic variations of various parameters using the procedure of spectral-profile analysis. This procedure has been successfully used in the Atlas of Natural Processes. In this work, the manifestation of spatial rhythmic variations is considered using the example of vertical profiles, composed of the values of the P-wave velocity of three Superdeep Boreholes: Kola (SG-3), Vorotilovskaya (VSG) and Ural (SG-4). Using wavelet analyses, we estimated the periodicities in the velocity variations and represented the seismoacoustic models of the SG-3, VSG and SG-4 geological section as a set of the blocks with varying sizes located in the upper part of the Earth’s crust. These blocks reflect the influence of different geodynamical processes at various depths. It was found that the hierarchical sequence of the average vertical sizes of the blocks corresponds to the hierarchical model of the geophysical medium. The geodynamical processes, which resulted in the cyclic variations of P waves velocities in the geological section of the Kola (SG-3), Vorotilovskii (VSG) and Ural (SG-4) Superdeep Boreholes, include: the alternation of the epochs of volcanic activity and sedimentation, tectonic movements, impact events, penetration of intrusive bodies and amphibolite dikes in the intervals of relatively weaker rocks, as well as metamorphic and metasomatic transformations of the rocks. The study of the sections of the Superdeep Boreholes can be considered, to some extent, as a realscale simulation of the crustal structure of the Earth up the large depths. Studies have shown that variations of the physical properties of the Earth's crust rocks and the hierarchical sequence of the average vertical sizes of the blocks have common properties of cyclic processes involved in the environment “self-organization”.