The results of testing the algorithm and the software module created on its basis are presented. The algorithm allows us to build a velocity model of the medium upper part using the times of the first arrivals of seismic signals related to refracted waves. The module implements two possibilities of these times determination. The first involves determining the times before the module is starting. The second implements the automatic determination of such times from the original seismograms using neural networks.

The results of regional geological exploration at the expense of the federal budget in the territory of the Angara–Lena oil and gas region from 2006 to 2017 are analyzed. Based on a comprehensive interpretation of data from geophysical surveys of wells and seismic surveys, relief maps of the roof of the Chora Formation, thicknesses and sandiness of the Parfenov gas-bearing horizon were updated. Based on the interpretation of a complex of GIS data, seismic exploration and deep drilling, a conclusion was made about the nature of the change in the sand content of the Parfenov gas-bearing horizon.

An approximate estimation of the heat flow value was performed for three deep parametric wells drilled in the northern part of the Indigiro-Zyryansky trough. Boreholes have uncovered Paleogene and Upper Jurassic rocks. Geothermal gradients were calculated from the temperature values at the lower boundary of the cryolithozone (0 ºC) and at the downhole. The thermal conductivity of rocks was roughly estimated from published data. The calculated heat flow on the Indigirskaya area is on average 70 mW/m2 . The values of heat flow values were recorded in the previously studied neighboring areas. Thus, the heat flow estimate obtained by the authors in the Indigiro-Zyryansky trough correspond fully to the available data on the heat flow level in this region of East Yakutia.

A simple and numerically effective approach for calculating frequency dependent qP-rays in threedimensional TTI media is presented in this paper. Our method involves propagating a locally plane fragment of wavefront which is sensitive to the distribution of the model parameters in some subvolume of the medium near a ray. The width of the sensitivity area depends on the wavelength in each point on the ray. For numerical realization we apply approximate expressions for phase and group velocities which are valid for weak TTI media. Numerical experiment proves the effectiveness of the proposed approach

The work analyzes the connection between a series of Turkish earthquakes in February 2023 and coseismic displacements and deformations on the Earth's surface. In areas of seismic rupture during the five days, there are recordings of three earthquakes on February 6 with magnitudes 7.8, 6.7, 7.5 and then for 5 days period – 42 events of magnitude 4.5–6.0. This work analyzed data obtained by various geodesy methods in the epicentral region. Coseismic effects in a 300 kilometers zone, covering a significant part of the East Anatolian Fault, are considered. Relative displacements up to 6 m have been recorded, with an average value 4 m. When for studying far-field effects, we used GPS network data from 27 international stations, of which seven stations located in Turkey. For the closest to the epicenters of the main aftershock on February 6, 2023, MERS station received coseismic 3D displacements up to 20 mm. The displacement and deformation fields have been constructed according to IGS data. Rates of coseismic deformations in the far zone reach up 10–8 , which is an order of magnitude higher than the background values of 10–9 . Post-seismic horizontal and vertical displacements rates of the Earth's surface in areas of Turkey, located to the southwest of the earthquake epicenters can be associated with floods. A study of displacements rates and deformations of the territory was carried out Turkey and its surroundings in the era of 2017–2023. Highlighted decrease displacement rates two years before seismic activation in 2023. The resulting picture of displacement and deformation rates reflects a current processes in the territory located on the borders of Anatolian Block and tectonic plates: Eurasian, Arabian, and African.