【摘要】 地震信号能量和频率随着时间的推移而改变,仅仅从时间域或频率域来分析信号已不能充分地描述地震信号的特征。基于Hilbert-Huang变换(HHT),把非稳态的地震信号分解为不同分辨尺度的基本模态分量,利用不同模态分量的瞬时时频特征精细刻画地震信号的时间-频率-能量之间的关系,探讨了HHT在面波压制方面的应用。应用结果表明,HHT在时频域可以较好地达到衰减面波的目的。更多还原

【Abstract】 The energy and the frequency of seismic signal were varied with time,so it was difficult to characterize seismic signal accurately and subtly only in the field of time or frequency.Based on Hilbert-Huang transform,the non-stationary seismic signal could be decomposed into a finite and small number of intrinsic mode functions and the relation between time-frequency-energy of seismic signal could then be identified accurately by using the instantaneous time-frequency analysis of different model signal.The application of Hilbert-Huang transform in compressing wave is studied.The result shows that Hilbert-Huang transform can attenuate surface wave accurately in time-frequency field.更多还原