We consider a problem of formal evaluation of spatial resolution in seismic tomography. We have shown that a traditional method of resolution estimate based on calculation of the resolution matrix appears to be misleading in a case of using the parameterization grid with different spacing. We have proposed an alternative algorithm based on reconstruction of a series of unit anomalies of fixed shapes. Furthermore, we have developed an algorithm for the direction dependent resolution estimates.

The paper considers an algorithm for calculating reflection coefficients from boundary between two HTI media. Analysis of the presence of anisotropy above and below the target boundary, as well as variations in the parameters of HTI media, was done. Interpretation of reflection data from the boundary between two HTI media with neglect of anisotropy above or below potentially leads to significant errors in estimation of symmetry axes directions, and hence fracturing orientation. Overestimation/underestimation of an elastic parameter in the overlying HTI medium could lead to a corresponding overestimation/underestimation of similar parameter in the underlying target layer in the result of AVAZ inversion. Furthermore, among the anisotropy parameters Thomsen parameter γ has most significant influence on the reflection coefficients dependences. Thus, the parameter γ could be used foremost as a result of the AVAZ inversion.

Using experimental data obtained from the network of stations installed on Kambalny volcano in the period from July 2018 to July 2019, a set of correlation functions was obtained and its preliminary interpretation was carried out. Works aimed at quality control of the obtained cross-correlation functions have been performed. We have identified considerable variations of the frequency-amplitude characteristics of the cross-correlation functions at small times, as well as significant shifts of the derived phases in large correlation times. Such variations of the cross-correlation patterns may indicate the existence of distinct time periods with different types of seismicity, as well as strong variations of mechanical properties of rocks. In turn, this might be an evidence for the ongoing activity of the magmatic system beneath the Kambalny volcano.

Analysis of seismic cross sections in the Laptev Sea showed that a sedimentary basin is developed in the western part of the water area, the thickness of platform deposits in which is 15–20 km. A complex interpretation of geological and geophysical materials on the continental margin of the Siberian platform and the Laptev Sea water area was carried out, seismogeological models of sedimentary complexes on the continent and in the sea were compared, and gravity and magnetic anomalies were analyzed. The research results showed that the western part of the Laptev Sea, in geological terms, is a northern continuation of the Siberian platform. The oil and gas potential of this part of the water area will be associated with the Upper Proterozoic-Middle Paleozoic carbonate deposits and Permian-Mesozoic terrigenous sedimentary complexes.