The Deep Seismic Structure of the Pacific Tectonic Belt along the 8-DV Reference Profile

Deep seismic studies along the Central Sikhote-Alin reveal significant crustal and upper mantle variations, with P-wave velocities ranging from 4.0 to 8.3 km/s across distinct tectonic zones. The research identifies a complexly faulted and folded Paleozoic sedimentary basin within the Middle Amur region, characterized by low-velocity deposits, and a displacement of 4–5 km along the Central Sikhote-Alin deep fault. Crystalline rocks with velocities of 6.0–6.2 km/s were found at varying depths, while crustal thickness increases from 32–34 km in the north to 36–37 km in central and eastern regions. Anomalies correlated with structural-tectonic zones and seismicity highlight increased heterogeneity and seismic activity within the Middle Amur sedimentary basin.

Soloviev, V. M., Salnikov, A. S., Seleznev, V. S., Kashubina, T. V., Liseykin, A. V., & Galeva, N. A. (2024). The Deep Seismic Structure of the Pacific Tectonic Belt along the 8-DV Reference Profile. Russian Journal of Pacific Geology, 18(2), 169–182. https://doi.org/10.1134/s1819714024020088