Possibility of Determining Deep Structure of the Earth's Crust in the Eastern Siberia Based on the Materials of River Seismic Profiling

Abstract

The article presents possibility of determining deep structure of the Earth`s crust by low-amplitude signals of longitudinal reflected waves at times up to 14-15 s due to wide dynamic range of the using equipment and multiple summation up to 2500. The conclusion is based on the results of long-duration (up to 23 s) seismograms analysis, carried out after reprocessing of the archival materials of river seismic profiling by the CDP-2D method in a 60-kilometer section in the lower part of the Lena river in 2018, exactly it was the materials of continuous ground-based registration of seismic oscillations by "Baikal" equipment from "Malysh" water pneumatic sources. High multiplicity is obtained by reducing the distance between shot points, adding source-receiver distances and increasing bin size. In the Eastern Siberia more than 2700 km of profiles were carried out using similar technologies; it allows to identify structure of the Earth's crust of the areas, which have not been studied by deep seismic methods previously.