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This paper considers the geological structure, geodynamics, and seismicity of the Tan Lu-Okhotsk rift system, which includes the Bohai Wan, Liaohe, Khanka, Middle Amur, and Lower Amur basins. The basins have common regularities typical of rift zones but differ in the deep structure and physical parameters of their crust, in particular, in the distribution of the strength properties, which also affect the seismicity level. It was established that the level and type of seismicity in the rift system is mainly determined by the local geodynamic conditions. [ABSTRACT FROM AUTHOR]