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- Title
Self-Similarity Parameters of the Water Stream Network and Neotectonics of Northern Sikhote-Alin and Adjacent Regions.
- Authors
Zakharov, V. S.; Simonov, D. A.; Gil'manova, G. Z.; Didenko, A. N.
- Abstract
A morphostructural analysis of the relief and a comprehensive analysis of the self-similarity of the water stream network and seismicity of the Northern Sikhote-Alin and adjacent regions are carried out. A series of monobasic and difference surfaces are constructed which make it possible to trace the history of the neotectonic development of the region presumably from the Eocene. It is shown that the formation of the relief in the region occurred in several stages, which is reflected in the formation of the pattern of the stream network. The most intense vertical movements occurred at the early stages of the neotectonic period. In the Pleistocene, stabilization occurred, and the amplitude of vertical movements was insignificant. The modern erosion-denudation relief was formed at this time. An insignificant activation of vertical movements occurred at the end of the Pleistocene and Holocene. An analysis of the self-similarity of the regional water stream network, reconstructed on the basis of the DEM, is carried out. A modification of the previously proposed complex Parameter of River Networks Self-similarity (PRNS) is considered. Instead of the parameter of the streams by length distribution (α), we use the parameter in the ratio of the total lengths of stream of each order (Dh), which have a similar meaning and dependence on tectonic movements. Modification of the PRNS makes it possible to improve the correlation with the neotectonic movements detected by the morphostructural method. The results of morphostructural and fractal analyzes are compared, showing a satisfactory correlation: the maxima of the PRNS as a whole coincide with the regions of the greatest relief increment, and the minima with the regions with the smallest relief increment, or with the regions of the most significant erosion. It is shown that the parameters of the self-similarity of the water stream network mainly reflect the vertical movements occurring at the final stages of neotectonic development. An analysis of the self-similarity of the earthquake epicenters field is carried out. It is found that the increased values of the fractal dimension of the field of earthquake epicenters (De) are associated with the gradient zones of PRNS, which reflects vertical movements at the final stages of neotectonic period.
- Subjects
NEOTECTONICS; FRACTAL dimensions; PLEISTOCENE Epoch; WATER analysis; HOLOCENE Epoch
- Publication
Izvestiya, Atmospheric & Oceanic Physics, 2021, Vol 57, Issue 8, p882
- ISSN
0001-4338
- Publication type
Article
- DOI
10.1134/S0001433821080090