重复重力测量结果计算垂线偏差的时间变化

PLUMB LINE DEFLECTION VARIED WITH TIME OBTAINED BY REPEATED GRAVIMETRY

根据滇西和华北地震重力监测网 2 8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 .0 2″以内 ;2重复重力测量方法可在 0 .0 1″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 。

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 28 and 39 campaigns of gravimetry at the local gravity networks in the Western Yunnan Earthquake Prediction Experiment Area and the North China, respectively. 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( by the modeling based on the precession of repeated gravimetry. This implies that repeated gravimetry could be used to determine the PLV. ③ There exist some common and different characteristics for the different places and different components. It may provide a new approach for the study on the local or global geodynamic by using repeated gravimetry.