【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 .更多还原

【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.更多还原