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中国及邻区大地水准面异常的场源深度探讨

A STUDY OF THE DEPTH OF GEOID ANOMALY SOURCESIN CHINA AND ITS ADJACENT REGIONS

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【作者】 方剑许厚泽

【Author】 FANG JIAN 1,2) HSU HOU-TZE 1) 1) Institute of Geodesy and Geophysics, Chinese Academy of Sciences, Wuhan 430077, China2) Institute of Geology, China Seismological Bureau, Beijing 100029, China

【机构】 中国科学院测量与地球物理研究所中国科学院测量与地球物理研究所 武汉430077中国地震局地质研究所北京100029武汉430077

【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— 6 0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 6 1— 72 0阶 ;下地幔重力位球谐函数阶数为 2— 6阶 ;而 7—6 0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 .

【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 260 is best to describe the mantle geoid anomaly. The results show that the best order of the geo-potential is 61720 for the lithosphere, 760 for the upper mantle, and 26 for the lower mantle.

【基金】 国家自然科学基金资助项目 ( 4 9874 0 1 6 ;4 9734 0 1 5 )
  • 【文献出处】 地球物理学报 ,Chinese Journal of Geophysics , 编辑部邮箱 ,2002年01期
  • 【分类号】P313
  • 【被引频次】20
  • 【下载频次】160
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