最新全球重力数据库V23中陆域重力资料质量评估

发布时间：2018-06-17 02:43

本文选题：质量评估 + 陆域重力资料　；参考：《地球科学进展》2017年01期

【摘要】：为了评估最新全球重力数据库V23中陆域重力资料的质量问题,选择了美国、秘鲁、爱尔兰、南非、肯尼亚、澳大利亚、中国等7个国家的8个区块约133万km2的重力数据进行对比分析。基于V23中自由空间重力异常数据,利用纯球坐标系内重力校正方法获得了这些区块的计算布格重力异常。利用相关分析的方法对这些区块的实测布格重力异常和计算布格重力异常进行相关分析,得到了相应的相关系数。通过对实测布格重力异常和计算布格重力异常之间相关系数及差值特征的综合分析,评估了全球重力数据库V23中选取的8个区块重力数据的质量。研究结果表明,斯克里普斯海洋研究所发布的最新全球重力数据库V23中陆域重力资料融合了大量测量年代较早的地面重力数据或者航空重力数据,而近十几年新完成的地面重力资料或者航空重力资料可能未融合进该数据库。具有大量年代较早的地面或者航空重力测量资料的区域,该数据库中陆域重力资料的质量较高,而重力工作程度较低的区域,其资料的质量则较低。
[Abstract]:To assess the quality of terrestrial gravity data in the latest global gravity database V23, the United States, Peru, Ireland, South Africa, Kenya, Australia, Gravity data of about 1.33 million km2 from 8 blocks in seven countries, including China, were compared and analyzed. Based on the free space gravity anomaly data in V23, the calculated Bouguer gravity anomaly of these blocks is obtained by using the gravity correction method in the pure spherical coordinate system. The correlation analysis of the measured Bouguer gravity anomaly and the calculated Bouguer gravity anomaly in these blocks is carried out by using the method of correlation analysis, and the corresponding correlation coefficients are obtained. Based on the comprehensive analysis of the correlation coefficient and the difference characteristics between the measured Bouguer gravity anomaly and the calculated Bouguer gravity anomaly, the quality of the gravity data of 8 blocks selected from the global gravity database V23 is evaluated. The results show that the latest global gravity database, V23, released by the Scripps Institute of Oceanography, combines terrestrial gravity data from a large number of earlier measured ground gravity data or aeronautical gravity data. The newly completed ground gravity data or aeronautical gravity data may not be integrated into the database. The area with a large number of earlier ground or aeronautical gravimetric data is of high quality in this database, but the quality of the data is lower in the area with low gravity working degree.
【作者单位】：西安石油大学地球科学与工程学院;中国地质调查局天津地质调查中心;
【基金】：中国地质调查局项目“新疆东部地质—地球物理资料综合研究”(编号:121201011000150012-01) 西安石油大学项目“新疆东北部盆地基底构造属性及盆山构造关系研究”(编号:2016BS10)资助~~
【分类号】：P631.1

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