【摘要】 为研究海域近断层地震动的特征，基于日本海底观测台网68 387组海域三分量地震动记录，分别通过小波分析、能量法、希尔伯特黄变换法，识别出49条海域脉冲型地震动。基于识别出的海域脉冲型地震动，建立了海域速度脉冲周期和矩震级的回归模型、海域速度脉冲幅值与矩震级和断层距的回归模型并与前人模型进行了对比。研究表明，海域速度脉冲周期较陆域脉冲周期在小震级时偏大，而在大震级时偏小。海域速度脉冲幅值在断层距较小时，小于陆域速度脉冲幅值，而随着断层距的变大，逐渐高于多数陆域模型，且衰减速度更慢。该研究通过识别海域脉冲型地震动、分析特征和建立的海域脉冲参数模型，可为海洋工程结构的抗震分析提供海域脉冲型地震动输入模型。更多还原

【Abstract】 In order to study the characteristics of offshore near-fault ground motions, 49 offshore pulse-like ground motions were identified from 68 387 sets of three-component ground motion records obtained from a seafloor observation network, by using wavelet analysis, energy method, and Hilbert-Huang transform method. Based on these identified offshore pulse-like ground motions, regression models for the period of offshore velocity pulses versus the moment magnitude, as well as for the amplitude of offshore velocity pulses versus the moment magnitude and rupture distance, were established and compared with previous onshore models. The study shows that the period of offshore velocity pulses is longer than that of onshore pulses at small magnitudes but shorter at large magnitudes. The amplitude of offshore velocity pulses is smaller than the values predicted by most onshore models at small rupture distances, but exceeds predictions by most onshore models as the rupture distance increases, and decays at a slower rate. By identifying offshore pulse-like ground motions, analyzing their characteristics, and establishing the pulse parameter models, the study provides offshore specific pulse-like ground motion input models for the seismic analysis of marine structures.更多还原