中文摘要：

为了给舰船地震波在水雷引信中的应用提供理论依据，基于波动理论推导了两层半无限海洋环境中舰船地震波的激发机理和质点的运动规律，获取了舰船地震波的传播特性。理论分析结果表明：舰船地震波的波动成分有Schohe波和简正波，都存在低频截止和频散现象，当频率增加到一定值后，频散现象消失，且质点的运动轨迹为椭圆；Schohe波的质点振幅离开海底迅速衰减，其能量主要集中在一个波长深度内，并且其横向衰减慢。应用高阶交错网格有限差分法数值模拟了舰船地震波的传播过程，给出了场量的波场快照和时域波形，数值模拟结果验证了理论推导结论。开展了湖试试验，给出了湖底地震波信号的时频分布特性，分析了舰船地震波作为水雷引信接收物理场的可行性。

英文摘要：

To provide a theoretical guidance for the application of ship seismic wave in mine fuze, the ex- citation mechanism and motion law of ship seismic wave in the semi-infinite two-layered ocean environ- ment are theoretically deduced based on wave theory, and then the propagation characteristics of ship seismic wave are also studied. The analysis results show that the ship seismic wave is composed of Scholte wave and normal mode wave, in which low frequency cutoff and frequency dispersion phenomena exist. When frequency increases to a certain value, the frequency dispersion phenomenon disappears, and the motion trajectory of the particle is elliptical. The particle amplitude of Scholte wave decays rapidly away from the seabed and its energy is mainly concentrated in the depth of one wavelength, but its lateral at- tenuation is small. A staggered grid finite difference method is applied to the numerical simulation of ship seismic wave, and the wave field snapshots and time-domain waveforms are given. The lake trial is car- ried out, the time-frequency distribution characteristics of lakebed seismic wave signal are presented, and the feasibility of using ship seismic wave as a new physical field of mine fuze is also analyzed.