| Moho面和上地幔间断面大尺度地形起伏的低阶球谐分析 |
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| 作者姓名： | 何小波 周蕙兰 |
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| 作者单位： | 中国科学院研究生院计算地球动力学重点实验室, 北京 100049 |
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| 基金项目： | 国家自然科学基金(40374009;40234047)资助 |
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| 摘 要： | 对全球地形高程和Moho面深度(CRUST20模型)及上地幔各间断面深度数据进行了球谐分析.在此基础上,通过叠加前4阶模式得到了各类数据的空间大尺度分布信息,通过叠加振幅平方值最大的4项得到了各类数据的空间主能量分布.结果表明,Moho面和‘410’间断面的地形存在半球尺度的大尺度非对称性,而且南北半球非对称性比东西半球的更显著;而‘520’和‘660’间断面的地形起伏已没有半球尺度那么大的非对称性,而是尺度略小些的不对称性.
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| 关 键 词： | 球谐分析 Moho面 上地幔间断面 非对称性 |
| 收稿时间： | 2004-07-29 |
| 修稿时间： | 2004-12-28 |
The Low Degree Spherical Harmonic Analysis on the Large Scale Topographies of the Moho and the Upper Mantle Discontinuities |
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| Authors: | HE Xiao-Bo ZHOU Hui-Lan |
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| Institution: | Laboratory of Computational Geodynamics, Graduate School of the Chinese Academy of Sciences, Beijing 100049, China |
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| Abstract: | In this paper, the global topography, the depth of the Moho(the cxustalmodel CRUST2.0)，th a depths ofupper mantle discontinuities were analyzed using the spherical harmonics. Based on these data, the spatial large scaledistribution information has been obtained by sacking the first 4 degree modes, and the main energy distributionshave been understood by synthesizing the four items with the maxunal squares of amplitudes. The results show thatthere exiss a large scale asynrrnetry on the scale of semisphere in the topographies of the Moho and the‘410'discontinuities, and the asynrrnetry character of the nor-tl}rsouth semispheres is more obvious than that of the westeast semispheres; However, there exiss a scale asymmetry on the small side in the topographies of‘520' and‘660'discontinu ides, instead of such a large sphere scale asynrrnetry. |
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| Keywords: | spherical harmonic analysis Moho upper mantle discontinuities asymmetry |
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