| Inversion of gravity and topography data for the crust thickness of China and its adjacent region |
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| 作者姓名： | 黄建平 傅容珊 许萍 黄建华 郑勇 |
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| 作者单位： | School of Earth and Space Science University of Science and Technology of China Hefei 230026 China，School of Earth and Space Science University of Science and Technology of China Hefei 230026 China，School of Earth and Space Science University of Science and Technology of China Hefei 230026 China，School of Earth and Space Science University of Science and Technology of China Hefei 230026 China，School of Earth and Space Science University of Science and Technology of China Hefei 230026 China |
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| 基金项目： | KZCX3-SW-131 Acknowledgments We would like to thank the CAS geodesy and geodynamics laboratory （Wuhan） for providing us the Bouguer gravity anomaly data. We also thank Professor WANG Yong, XI0NG Xiong and XU Jian-qiao for their thoughtful reviews on this article. The authors are grateful to the editor and the anonymous reviewers for their valuable comments. |
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| 摘 要： | Introduction Since the middle of the century, gravitational isostasy has been a fundamental hypothesis for inverting the gravity data to find the crust thickness. Geophysicists have done a lot of researches on using gravity data to investigate the depth of Moho discontinuity. Since 1980, the International Lithosphere Program emphasized the importance of investigating the Moho depth variation. Thereafter a lot of results have been published in the world (Braitenberg et al, 2000; Kaban et al,…
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| 关 键 词： | 地心重力 地壳均衡说 地形学 地壳结构 |
| 文章编号： | 1000-9116（2006）03-0264-09 |
| 收稿时间： | 2005-07-11 |
| 修稿时间： | 2006-03-11 |
Inversion of gravity and topography data for the crust thickness of China and its adjacent region |
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| HUANG Jian-ping,FU Rong-shan,XU Ping,HUANG Jian-hua,ZHENG Yong.Inversion of gravity and topography data for the crust thickness of China and its adjacent region[J].Acta Seismologica Sinica(English Edition),2006,19(3):264-272. |
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| Authors: | HUANG Jian-ping FU Rong-shan XU Ping HUANG Jian-hua ZHENG Yong |
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| Institution: | School of Earth and Space Science, University of Science and Technology of China, Hefei 230026, China |
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| Abstract: | The data of Bouguer gravity and topography are inverted to obtain the crust thickness of China. In order to reduce the effect
of regional non-isostasy we corrected the reference Moho depth in the inversion with regional topography relief, and performed
multiple iterations to make the result more reliable. The obtained crust thickness of China is plotted on a map in cells of
1°×1°. Then we analyzed the correlation between the Bouguer gravity anomaly and fluctuation of the Moho depth. A good linear
correlation is found, with a correlation coefficient of −0.993. Different correlation coefficients, 0.96 and 0.91, are found
for the data in land and ocean region, respectively. The correlation result also shows that the boundary between land and
ocean is generally along the bathymetric line of −800 m. In order to examine the influence of the Earth’s curvature on the
calculated result, we tried two inversion models: the inversion for the whole region and the inversion for 4 sub-regions.
The difference in the crust thickness deduced from the two models is less than 5 km. Possible explanation for the difference
is discussed. After comparing our result with that of other studies, we suggest that with our method the Bouguer gravity and
the topography data can be independently inverted to obtain the crust thickness of China and its adjacency.
Foundation item: KZCX3-SW-131 |
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| Keywords: | Bouguer gravity anomaly crust thickness gravitational isostasy |
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