Quality Evaluation of Land Gravity Data in the Latest Global Gravity Database V23
First author:Zhang Chunguan (1981-), male, Yudu County, Jiangxi Province, Associate professor. Research areas include integrated geophysical exploration and tectonophysics. E-mail: chunguan-zhang@163.com
Received date: 2016-10-27
Revised date: 2016-12-20
Online published: 2017-01-10
Supported by
Project supported by the China Geological Survey Project “Integrated study of the geological data and geophysical data in Eastern Xinjiang” (No. 121201011000150012-01);Xi’an Shiyou University Project “Tectonic attribute of basin basement and basin-mountain tectonic relation of the Northeastern Xinjiang” (No. 2016BS10).
Copyright
In order to evaluate the quality of the land gravity data in the latest global gravity database V23, the authors chose the gravity data of eight blocks with a total area of 1 330 000 km2 to compare and analyze, and these blocks involved seven countries, including the United States, Peru, Ireland, South Africa, Kenya, Australia, and China. Based on the free-air gravity anomaly data of the latest global gravity database V23, the authors obtained the calculated Bouguer gravity anomaly using the gravity correction methods within the pure spherical coordinate system in these eight blocks. Then, the correlation coefficients between the measured Bouguer gravity anomaly and the calculated Bouguer gravity anomaly were calculated by the correlation analysis method in these eight blocks. Finally, through comprehensive analysis of the features of these correlation coefficients and differences between the measured Bouguer gravity anomaly and the calculated Bouguer gravity anomaly in these eight blocks, the quality of the gravity data of these eight blocks was evaluated in the latest global gravity database V23. The results showed that the latest global gravity database V23, released by Scripps Institution of Oceanography, integrated a large number of the ground or airborne gravity data measuring in an earlier era, and the newly surveyed ground or airborne gravity data may not be integrated into the database. The quality of land gravity data is relatively high in the areas with a large number of older ground or airborne gravity data, otherwise it is low in the zones with a lower gravity working degrees.
Chunguan Zhang , Bingqiang Yuan , Guoli Zhang . Quality Evaluation of Land Gravity Data in the Latest Global Gravity Database V23[J]. Advances in Earth Science, 2017 , 32(1) : 75 -82 . DOI: 10.11867/j.issn.1001-8166.2017.01.0075
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