T相作为由海底震源激发且依据良好的海洋水声信道进行远距离传输的甚低频能量形式，可有效用于海底地震等活动远距离监测。对于T相的激发与传播中，复杂的海底地形环境既是有利的促进因素，也是限制条件，其在T相的研究中，特别是传播方面，往往考虑有限，从而导致理论计算和实测结果存在明显差异。因此，本课题在充分考虑复杂海底地形情况下，依据分裂-步进方法和海底震源的自初始场理论，建立T相传播预报模型。同时，结合广义射线等理论与水下甚低频声传播实验数据，从海洋波导的角度，分析海底地形等因素对T相激发与传播的影响，探索甚低频声能量的衍射等效应，并从而为海洋T相研究提供理论支撑，以及为基于T相的海洋灾害预警提供依据。

As a very low frequency energy form, which is excited by the hypocenter in elastic seafloor and is long-distinctly propagated by virtue of the favorable underwater acoustic waveguide, T-phase can be effectively used for the remote monitor for the sea quake. In the excitation and the propagation of T-phase, the complicated submarine topography is a favorable factor and a restricted condition. Nevertheless, the submarine topography acoustic effect could not be taken a full consideration and this result to a distinction on theoretical and actual measurement results. Therefore, after the thorough consideration of the submarine topography effect, we attempt to build a T-phase model by the method of operator splitting and the self-start theory of hypocenter under seafloor. Meanwhile, combined with the general ray theory and the very low-frequency underwater acoustic experimental data, the submarine topography effect on the excitation and the propagation of T-phase is researched and the diffraction effect is explored by the T-phase model from the aspect of ocean waveguide. The conclusion obtained will provide a theoretical support and an important evidence for the marine disaster based on the T-phase.