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利用定量方法研究了在固有重力作用下地球模型的动力自由振动现象。确定了地球在旋转惯性体力和太阳系中月球、太阳、行星潮汐力作用下的临界应力─—应变状态及在此作用力下地球模型动力稳定性的丧失。地球动力稳定性丧失引起的受迫振动的卓越频率与弹性自由振动的卓越频率在岩石圈的共振点彼此相同，受迫振动的周期数量级为小时，也与自由振动周期数量级相当，而由地球旋转惯性力和临界状态潮汐力引起受迫振动的周期为几天。岩石圈某些地点的共振效应是地震的触发机制，共振点上的动力残差引起了地震震源区的势能释放，产生了数量级为秒振动周期的地震波。因此，查明岩石圈中的共振效应和共振点就可以预测未来强地震的震中位置。
The free-vibration of the earth model under the inherent gravity is studied by using quantitative method. The critical stresses of the earth under rotational inertial forces and the lunar, solar and planetary tidal forces in the solar system-the strain state and the loss of dynamic stability of the Earth model under this force are determined. The remarkable frequency of the forced vibration caused by the loss of stability of the Earth’s dynamism and the excellent frequency of the elastic free vibration are the same at the resonance points of the lithosphere. The period of the forced vibration is on the order of hours and also on the order of magnitude of the free vibration period, Inertial forces and critical tidal forces cause forced vibration cycles for a few days. The resonance effect at some locations in the lithosphere is the trigger mechanism of the earthquake. Residual power at the resonance point causes the release of the potential energy in the seismic source area, resulting in the seismic wave of the order of second vibration period. Therefore, finding the resonance effect and resonance point in the lithosphere can predict the epicenter position of future strong earthquakes.