Issue: 11 , Volume: 66 , Уear of publication: 2025

Results of deep seismic studies based on P- and S-wave data on a 500-km Sikhote-Alin fragment of the 8-DV reference geophysical profile are presented. Deep seismic sections of the upper crust (to depths of 15-20 km) with distributed longitudinal and transverse wave velocities are constructed. The P-wave velocity over most of the Middle Amur Basin and the East Sikhote-Alin volcanoplutonic belt varies from 4-5 km/s in the uppermost section to 5.8-6.3 km/s at depths of 7-15 km. The Sikhote-Alin orogenic belt in the section along the profile is represented by an anticlinal structure with high-velocity (up to 5.5-5.8 km/s) rocks uplifted in the center; at great depths of 10-20 km within its limits, the P-wave velocities reach 6.1-6.3 km/s. In the top of the section, the S-wave velocities within the profile as a whole are 2.7-2.9 km/s. Lower values (2.6-2.8 km/s) are observed in the center and east of the Middle Amur Depression and the eastern section of the East Sikhote-Alin volcanoplutonic belt. Higher velocities up to 3.35 km/s are observed in the central Sikhote-Alin orogenic complex. At depths of 5-15 km within the section, the S-wave velocities increase up to 3.4-3.65 km/s. The heterogeneous structure of the top of the Earth's crust to depths of 15-20 km was identified using the P- and S-wave velocities, their ratio, and Poisson's ratio. The profile section was used to analyze a relationship between the identified anomalies and the location of large mineragenic zones in Russian Manchuria. The correlations established earlier on the 2-DV, 3-DV, 1-SB, and East Stanovoy fragment of the 8-DV profile are confirmed using the confinement of many ore deposits to zones of lower P- and S-wave velocity ratios and Poisson's ratio in the top of the Earth's crust. We also substantiated the relationship between the identified surface seismic anomalies and deep (at depths of 5-20 km) roots (intermediate magmatic foci), which can be considered as ore-supplying.