| Popis: |
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. |
