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本文对介质变形造成的重力变化作了定量分析,通过质点位移法(拉格朗日法)导出了介质位移场和由它产生的附加重力场之间的积分关系式.应用已有的弹性和粘弹性半空间任意倾角断层位错的位移表达式,本文通过三维空间数值积分,计算了弹性介质和广义开尔文介质中断层不同的运动方式所产生的地表附加重力场,以及介质流变性导致的重力随时间的变化趋势.参考唐山地震前沧东断裂的活动和震时断层错动,计算了震前震后相应的重力变化,其结果与实测重力资料有一定程度的符合.
In this paper, we quantitatively analyze the gravity change caused by the deformation of the medium and derive the integral relation between the displacement field of the medium and the additional gravity field generated by it by the particle displacement method (Lagrange method) In this paper, three-dimensional numerical integration is used to calculate the additional gravity field caused by different movement modes of elastic media and generalized Kelvin media, and the gravity caused by the rheology of media With the change trend over time.Considering the activities of Cangdong fault and the fault dislocation before Tangshan earthquake, the corresponding gravity changes after the earthquake were calculated, and the results are in good agreement with the measured gravity data.