In hydraulic engineering, deep-seated rupture zones have been discovered in some dam areas, such as Heishanxia of Huanghe River, Jinpingshan of Yalongjiang River and others. It is a new geological structure phenomenon. deep-seated rupture zones are usually situated in the pleistoseismic generating faults. Historic earthguakes frequently occur along the active structure zone. Deep seated rupture zones are 300 m or more beneath the surface, far exceeding the depth of surface unloading range. They are bound up with the dynamics effect of rock mass during earthquake happening. This paper discussed the seismologic reasons for the occurrence of deep seated rupture zones according to elastic wave kinetics.