大地水准面起伏对重力归算的影响研究  

Research on the Effect of Geoid Undulation on Gravity Reduction

作　　者：张品[1,2] 申重阳[2,3] 杨光亮[2,3] 王同庆[1] 陈兆辉[1] 张双喜[1] 

机构地区：[1]中国地震局第一监测中心,天津市耐火路7号300180 [2]中国地震局地震研究所(地震大地测量重点实验室),武汉市洪山侧路40号430071 [3]中国地震局地壳应力研究所武汉科技创新基地,武汉洪山侧路40号430071

出　　处：《大地测量与地球动力学》2017年第3期306-310,共5页Journal of Geodesy and Geodynamics

基　　金：国家科技基础性工作专项(2015FY210400);中国地震局"地震监测;预测;科研"三结合课题(153302);中国地震局地震行业科研专项(201008001;201308011);中国地震局震情跟踪定向工作任务(2016010203)~~

摘　　要：针对目前重力探测中重力改正时常用的两个高程参考系统存在偏差这一事实,选取两个大地水准面起伏变化较大的剖面区域,分析大地水准面起伏对重力归算的影响。结果表明,剖面跨度和剖面大地水准面起伏梯度都会对布格重力异常产生影响,所以当重力探测区域大地水准面起伏差距较大时,大地水准面与参考椭球面之间的差异对重力归算的影响比较突出,在利用布格重力异常反演、解释地壳密度结构时,大地水准面起伏的影响必须考虑。At present, there are two vertical reference systems that are commonly used in gravity cor- rection. Based on this fact, we choose two profiles with large geoid variation and discuss the effect of geoid undulation on gravity reduction. The results show that the profilers span and geoid gradient will influence on the Bouguer gravity anomaly, so when the gravity detection area＇s geoid undulation has large changes, the influence of the difference between the geoid and the reference ellipsoid on the gravity reduction is more prominent. When we calculate Bouguer gravity anomaly to inversion and in- terpretation, the effects of geoid undulation must he considered.

关 键 词：重力探测 高程系统 大地水准面起伏 布格重力异常 

分 类 号：P223[天文地球—大地测量学与测量工程]