重复重力测量结果计算垂线偏差的时间变化

根据滇西和华北地震重力监测网28期和39期重力测量资料，利用Vening-Meinesz公式，分别计算了下关和北京两地垂线偏差的时间变化．结果表明:① 垂线偏差的时间变化幅度一般在0.1以内，年际变化幅度在0.02以内；② 重复重力测量方法可在0.01的可信度范围内确定垂线偏差的时间变化，对比计算结果表明这种方法是可行的；③ 不同地点和方向的垂线偏差变化既存在相同点也存在不同点，它们将有可能为区域性的地球物理事件和大范围或全球性动力学研究提供新的途径． 

PLUMB LINE DEFLECTION VARIED WITH TIME OBTAINED BY REPEATED GRAVIMETRY

In this paper, the plumb line deflection varied with time (PLV) are calculated with the Vening-Meinesz formula for Xiaguan and Beijing point based on the 28th and 39th campaigns of gravimetry at the local gravity networks in the Western Yunnan Earthquake Prediction Experiment Area and the North China. Based on the results, we conclude that: ① the maximum of PLV is under 0.1″ and amplitudes of interannual variation are under 0.02″. ② PLV can be determined with the reliability of 0.01″. This means that repeated gravimetry could be used to determine the PLV. ③ There are some common and different characteristics on the different places and different component. It will provide a new approach in the local or global geodynamic study by using repeated gravimetry.