【摘要】 详细解释了Hilbert-Huang变换(HHT)的思想和基本理论,利用HHT方法对汶川8.0级的地震记录进行了经验模态分解(EMD),并对其Hilbert-Huang三维时间-频率-幅值(能量)图谱、边际能量谱和瞬时能量谱进行了分析讨论。研究表明,基于HHT的Hilbert谱能够精准和清晰地揭示地震记录的时-频-能量分布。更多还原

【Abstract】 The idea and theoretical basis of Hilbert-Huang transform(HHT) was explained in detail.Then strong earthquake records obtained from Wenchuan 8.0 magnitude earthquake were analyzed by using the EMD and Hilbert Transform method of HHT.Based on the calculated results,Hilbert-Huang dimensional time-frequency-amplitude(energy) spectrum,marginal energy spectrum and the instantaneous energy spectrum were analyzed and discussed.The result illustrates that the HHT-based Hilbert spectra is able to reveal the temporal-frequency energy distribution for ground motion records precisely and clearly.更多还原