Based on the data of the relief analysis and the geophysical fields, major submeridional and NW-trending hidden faults are detected in the Priamurye region. The seismic energy calculations are performed for the instrumental observation period given the historical events. The faults showing the highest seismic activity are revealed. The seismic energy released by hidden faults is commensurable with a similar value obtained for the seismoactive faults detected from the geological data.

The paper investigates indications of the NW-trending hidden faults in the Priamurye region. Four maijor fault zones and a series of lower-rank faults are mapped, which are indicated by lineaments of the relief, magnetic anomalies and arranged earthquake foci sequences. The NW-trending faults control the block divisibility of the upper part of the lithosphere in the region and are currently seismically active. Two NW-trending hidden faults are characterized by a considerable amount of the seismic energy released which should be accounted for in the seismic hazard assessment of the region.

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