In this study, the passive interferometry method was applied for the first time in Russia to 60 hours of
continuous seismic recordings acquired along a local seismic profile with a 50-cm receiver spacing. As a result of applying the method, cross-correlation functions of ambient seismic noise were constructed for all receiver pairs. The all constructed crosscorrelations reveal Rayleigh surface waves propagating between the receivers. The new, Stokwell–Bessel transform based method was then applied to these waves to extract the average dispersion curve of the Rayleigh-wave phase velocity. It has proven effective for use in short receiver spacing and short spreads. The successful retrieval of the dispersion curve demonstrates that noise interferometry can be considered as a viable method for engineering seismic surveys.
We study the possibility of expanding the low-frequency range of land seismic exploration using monochromatic seismic sources. Low frequencies are particularly important for the application of seismic full-wave inversion (FWI). Generating frequencies below 5 Hz presents a significant challenge for modern hydraulic vibrators. The authors investigate the possibility of using lower-frequency unbalanced vibrators in monochromatic signal mode. We implemented a frequency-domain full-wave inversion for testing the fundamental possibility of gradually constructing a velocity model from monochromatic signals with an incremental frequency step of 2 Hz. The resulting velocity model is better than the standard FWI of data from a continuous sweep signal starting from 5 Hz. This study demonstrates the potential of using monochromatic sources to expand the lower frequency range of seismic exploration.
The article presents the results of detailed seismological observations in the Lena River delta area using a record number of 15 temporary stations in this area. During the period from August 2024 to February 2025, signals from 326 earthquakes were isolated and processed from continuous recordings. The vast majority of hypocenters are confined to fault structures located in the northern part of the Kharaulakh ridge. The positive effect of the network's thickening points around this area is clearly demonstrated: a large number of weak earthquakes have been recorded, and local seismicity zones are clearly separated on the vertical sections.
The article is devoted to the construction of coordinated seismogeological models of the platform deposits
geological structure in the northern and Arctic regions of the West Siberian oil and gas province, which administratively cover the northern regions of the Yamal–Nenets Autonomous District, the northwest of the Krasnoyarsk Region and the shelf of the southern part of the Kara Sea. The characteristics of the reference seismic horizons that control the Mesozoic–Cenozoic seismogeological megacomplexes, corresponding in volume to the main oil-bearing megacomplexes, are presented. The Cretaceous reference horizons M, M1 and G, identified on seismic sections and confined to the tops of the Neocomian, Aptian and Cenomanian, and the horizon B, formed on the top of the Jurassic, are reliably stratified using the seismic logging (SL) – Vertical Seismic Profiling (VSP) data. In the work, using data from the ultra-deep wells SG-6, SG-7, the identification of reflecting horizons formed at the geological boundaries of the Jurassic–Triassic, Triassic–Paleozoic is substantiated, regional seismogeological models of the Triassic and Jurassic megacomplexes, as well as Upper Proterozoic–Paleozoic deposits of the Yenisei–Khatanga regional trough are proposed.
