SNRVEI地球模型连续分布的简正模及其意义

基于Peltier等建立的粘弹地球表面负荷形变理论，运用简正模分析法，实现了SNRVEI粘弹地球模型表面负荷勒夫数从拉氏域至时间域的变换．数值结果印证了韩大仲关于真实地球存在“连续分布的简正模”的结论，同时还表明在保证较高计算精度前提下，为便于计算，将地球核慢边界以上部分划分成较少个物性均匀层是可行的．本文的方法和结果经过数值检验，可用于冰后相对海平面变化、地球自转非潮汐加速度变化等地表负荷均衡动态响应观测量的研究．

CONTINUOUSLY DISTRIBUTED MODES OF SNRVEI EARTH MODEL AND THEIR EFFECTS

According to the deformation theory of viscoelastic earth under surface load established by Peltier W. R. (1974, 176) et al., in this paper we, by using full normalmode analysis method, accomplished the inversion of loading love number spectra ofSNRVEI viscoelastic earth model. The results firstly confirmed the existence of continuouslydistributed modes presented by Han and Wahr (1995) for realistic earth. Furthermore, forthe convenience of computation, we could take the media between core-mantle boundaryand earth surface as fewer homogeneous layers without deteriorating the precision obviously.These methods and results were strictly examed by computation, and may be utilized tostudy the variations of post-glacial relative sea level, non-tidal acceleration of earthrotating and other isostatic dynamical responses caused by surface loads.