| 中国及邻区大地水准面异常的场源深度探讨 |
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| 引用本文： | 方剑,许厚泽.中国及邻区大地水准面异常的场源深度探讨[J].地球物理学报,2002,45(1):42-48. |
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| 作者姓名： | 方剑 许厚泽 |
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| 作者单位： | 1. 中国科学院测量与地球物理研究所,武汉,430077;
2. 中国地震局地质研究所,北京,100029 |
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| 基金项目： | 国家自然科学基金资助项目 ( 4 9874 0 1 6，4 9734 0 1 5 ) |
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| 摘 要： | 利用中国及邻区地形、地震层析成像、沉积层底面、Moho面及岩石层底面资料,正演计算出中国及邻区岩石圈大地水准面异常;再从全阶大地水准面异常中扣除正演模拟得到的岩石圈大地水准面异常与不同阶次波段的大地水准面进行比较,寻求表示中国及邻区地幔物质不均匀的大地水准面异常的最佳阶次为2-60阶. 结果表明,对应于岩石圈的大地水准面异常的重力位球谐函数阶数为61-20阶;下地幔重力位球谐函数阶数为2-6阶;而-60阶重力位球谐函数则表示中国及邻近区域上地幔大地水准面异常.
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| 关 键 词： | 中国及邻区 大地水准面异常 球谐函数 最佳阶次 场源深度 |
| 文章编号： | 0001-5733(2002)01-0042-07 |
| 收稿时间： | 2000-12-26 |
A STUDY OF THE DEPTH OF GEOID ANOMALY SOURCES IN CHINA AND ITS ADJACENT REGIONS |
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| FANG JIAN , HSU HOU-TZE Institute of Geodesy and Geophysics,Chinese Academy of Sciences,Wuhan ,China Institute of Geology,China Seismological Bureau,Beijing ,China.A STUDY OF THE DEPTH OF GEOID ANOMALY SOURCES IN CHINA AND ITS ADJACENT REGIONS[J].Chinese Journal of Geophysics,2002,45(1):42-48. |
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| Authors: | FANG JIAN HSU HOU-TZE Institute of Geodesy and Geophysics Chinese Academy of Sciences Wuhan China Institute of Geology China Seismological Bureau Beijing China |
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| Institution: | 1. Institute of Geodesy and Geophysics, Chinese Academy of Sciences, Wuhan 430077, China;
2. Institute of Geology, China Seismological Bureau, Beijing 100029, China |
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| Abstract: | The paper simulates the middle-short wavelength geoid anomaly in China and its adjacent regions by using the results of tectonics and distribution of density, detected by of tomography, seismic sounding and telluric electromagnetic sounding method. The geoid anomaly caused by the Moho interface is similar to the geoid anomaly caused by topography, but the undulation range is much less than later. Deducting the lithosphere simulated geoid anomaly from the geoid, we can obtain the mantle geoid anomaly. Comparing the mantle geoid anomaly to the geoid calculated by different order geo-potential model, we find that order 2_60 is best to describe the mantle geoid anomaly. The results show that the best order of the geo-potential is 61_720 for the lithosphere, 7_60 for the upper mantle, and 2_6 for the lower mantle. |
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| Keywords: | China and its adjacent regions Geoid anomaly Simulation Best order and degree Depth of field sources |
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