For the sake of stress relaxation, the tectonic boundary between these two different terrains (i. e. the Lingshan structure zone) expressed as a dextralfault in late period.
由于应力弛张作用，使两地体间的构造分界线（灵山构造带）后期表现为左旋断层性质。
2
Since the Tertiary period, the Red River Fault Zone suffered both of the sinistral movement and dextral movement, but the activities of the north and the south segment were different.
断裂带自第三纪以来，经历了左旋运动、右旋运动，南北两段的活动性有一定的差异。
3
The main shock occurred on the dextral obduction-type fault zone and the hypocenter depth was about 15km .