大地水准面起伏对地球内部密度结构反演的影响  

EFFECT OF GEOID UNDULATION ON INVERSION OF DENSITY STRUCTURES OF THE EARTH

作　　者：王新胜[1,2,3] 方剑[2] 

机构地区：[1]地壳运动监测工程研究中心,北京100045 [2]中国科学院测量与地球物理研究所大地测量与地球动力学国家重点实验室,武汉430077 [3]中国科学院地质与地球物理研究所地球深部研究重点实验室,北京100029

出　　处：《大地测量与地球动力学》2014年第2期10-13,共4页Journal of Geodesy and Geodynamics

基　　金：国家自然科学基金(41304057;41204013);大地测量与地球动力学国家重点实验室开放基金(SKLGED2013-3-5-E);中国科学院地球深部研究重点实验室开放基金;地壳运动监测工程研究中心科技项目

摘　　要：计算了中国大陆地区大地水准面起伏引起的重力效应,得到了改正后的布格重力异常。讨论了在不同地形情况下大地水准面起伏重力效应及其与布格重力异常之间的相对比值,发现两者与地形具有明显的相关性,前者在盆地地区最大,后者在我国地形第三阶梯最大,盆地地区次之。建议在利用布格重力异常反演和解释地球内部密度结构时,要考虑大地水准面起伏引起的重力效应,尤其是在我国地形第三阶梯和盆地地区。Difference between geoid and reference ellipsoid called geoid undulation. Bouguer gravity anomalies are widely used in density inversion,however,the effects of geoid undulation on gravity were not considered in traditional gravity corrections during the calculation of bouguer gravity. Effects of geoid undulation on gravity were calculated,and bouguer gravity anomalies under consideration of the effects were obtained,as well as,the gravity effects and its relative ratios to bouguer anomalies were analyzed. The results indicate that both of them is coherent with terrain distributions,the largest effects of geoid undulation on gravity locate in basins while the largest relative ratios locate in the third terrain ladder of China mainland. It is suggested that the gravity effects of geoid undulation should be considered when bouguer gravity anomalies were used to invert and interpret density structures,especially in the third terrain ladder of China mainland and basin areas.

关 键 词：布格重力异常 大地水准面 重力效应 地球密度 反演 

分 类 号：P312.1[天文地球—固体地球物理学]