Neotectonic vertical movements of the South Sikhote-Alin and characteristics of self-similarity of the stream network

Abstract

Morphostructural analysis of the relief and fractal analysis of the stream network of the South of the Sikhote-Alin orogenic belt were carried out. The formation of the relief at the neotectonic stage occurred in several stages, which was reflected in the stream network pattern: 1) during pre-Oligocene time there was a general uplift of Sikhote-Alin; 2) in the Pliocene there was an activation of vertical neotectonic movements, most intense to the East of the Central Sikhote-Alin fault and synchronous whith basalt volcanism; 3) in the Pleistocene vertical movements of significant amplitude did not occur, at this time the modern erosion-denudation relief of the region was formed; 4) at the end of the Pleistocene and in Holocene there was a slight activation of vertical movements to the East of the Central Sikhote-Alin fault, which was reflected in the peculiarities of residual relief. Comparison of morphological and fractal analysis results showed, that the maximum of complex parameter of self-similarity PRNS coincide with the areas of greatest increments in elevation and the minima is the smallest increment of relief or whith the areas whith most significant erosion. In regions with the stage character of neotectonic development during fractal analysis of stream network it is necessary to consider additional factors due to the peculiarities of development of the stream network at each stage of development, and conservative of its pattern, reflecting features of the development of the relief in different stages.