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地球内部广泛表现为各向异性,其中方位各向异性是较早发现且被证实.方位各向异性的计算已有较成熟的理论,但关于其具体计算推导尚没有Rayleigh波的.本文给出了Rayleigh波相速度方位各向异性计算及详细推导过程.并在蒙古中南部地区开展了相速度方位各向异性结构的研究.结果显示相速度方位各向异性可以很好地反映区域内的构造应力特征,对揭示研究区内构造演化动力学机制提供了重要的线索.
The anisotropy is widely observed in the interior of the Earth, of which azimuthal anisotropy was found earlier and confirmed. There have been more mature theories for the calculation of azimuthal anisotropy, but there is no Rayleigh wave derived from the calculation of the azimuthal anisotropy. The azimuthal anisotropy calculation and detailed derivation of Rayleigh wave velocities were carried out and the azimuthal anisotropy of phase velocities was studied in central and southern Mongolia. The results show that the azimuthal anisotropy of phase velocities can well reflect the structure of the region The stress characteristics provide important clues for revealing the tectonic evolution kinetics in the study area.