【摘要】 高精度重力异常模型是研究地球内部结构的基础地球物理数据.本文依据中国大陆构造环境监测网络项目的 100个高精度绝对重力基准站数据,首先,分别与EGM2008模型和GGMplus模型进行对比,得到了模型之间的差异性特征统计参数;其次,我们对与绝对重力同点位测量的垂直梯度数据,进行统计分析,结果表明重力垂直梯度变化的标准差高达537.2E.通过提取Crust1.0地壳结构模型参数,计算得到了Moho界面起伏引起的垂直梯度变化,分析认为地表垂直梯度的变化主要与地形和浅部密度异常体相关.最后,基于重力场模型和观测数据的统计结果,针对经典重力异常计算公式中的一些流程提出了优化建议.本文结果对于使用区域重力异常模型,研究地壳结构和提高长剖面、小比例尺重力探查项目中的异常计算精度具有重要意义.更多还原

【Abstract】 It is very important approach that using high-precision gravity anomaly for studying structure of the earth’s interior. In this paper,we used the 100 high-precision Absolute Gravity( AG)observed results by the project of crustal movement observation network of China. Firstly,we have compared the AG results to the EGM2008 and GGMPlus models. The difference and related statistical parameters between the AG measurements and models have been obtained. Secondly, the Gravity Vertical Gradient( GVG) measurements have also been analyzed at the all AG stations. The standard deviation of GVG is 537. 2 E. We have estimated the GVG derived by Moho surface of Crust 1. 0 model. The results show the topography and shallow density bodies may mainly contribute the GVG variations. At last,we proposed the optimal comments on the conventional gravity anomaly calculation procedures. The results are significant on using regional gravity anomaly model,studying the crustal structure and improved the gravity anomaly accuracy in the small scale gravity survey project.更多还原