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The Low Degree Spherical Harmonic Analysis on the Large Scale Topographies of the Moho and the Upper Mantle Discontinuities
Received date: 2004-07-29
Revised date: 2004-12-28
Online published: 2005-05-15
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.
Key words： spherical harmonic analysis; Moho; upper mantle discontinuities; asymmetry
HE Xiao-Bo , ZHOU Hui-Lan . The Low Degree Spherical Harmonic Analysis on the Large Scale Topographies of the Moho and the Upper Mantle Discontinuities[J]. Journal of University of Chinese Academy of Sciences, 2005 , 22(3) : 315 -321 . DOI: 10.7523/j.issn.2095-6134.2005.3.009
[1] Ma ZJ,Song XD, Du PR, et al. Asymmetry between the southern and northern hemispheres of the earth. Chinese J. Geophys, 2002,45(1) : 26~ 32 (in Chinese with English abstract)
[2] Wang Y, Wang JY,Ma ZJ, et al. Asymmetry of the earth interior thermal loss distribution. Chinese Science Bulletin,1998, 43(11) : 1191~ 1194(in Chinese)
[3] Huang LR,Ma ZJ, Zhu JX. The newest observational evidence on asymmetrical deformation of the earth. Acta Seismologica Sinica, 2002, 24(2) : 196~ 199(in Chinese with English abstract)
[4] http:PPmahi. ucsd. eduPGabiPrem. dirPcrustPcrust2. html
[5] ftp:PPmahi.ucsd. eduPpubPTOPOTZP
[6] Blais JAR, Provins DA. Spherical harmonic analysis and synthesis for global multiresolution applications. Journal of Geodes., 2002, 76: 29~ 35
[7] Dahlen FA,Tromp J. Theoretical Global Seismology.New Jersey:Princeton Univ. Press, 1998.838~ 876
[1] 马宗晋, 宋晓东, 杜品仁, 等. 地球南北半球的非对称性. 地球物理学报, 2002, 45(1) : 26~ 32
[2] 汪 洋, 汪集, 马宗晋, 等. 地球内部热散失量分布的非对称性. 科学通报, 1998, 43(11) :1191~ 1194
[3] 黄立人, 马宗晋, 朱建新. 地球非对称变形的最新观测证据. 地震学报, 2002, 24(2) : 196~ 199
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