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2011年4月10日四川炉霍发生MS5.3地震。本文选取了此次地震中不同震中距的台站所获取的三分量加速度时程记录,针对目前EMD分解的HHT方法存在的模态混叠问题,采用了一种基于EEMD分解提取信号时频特性的方法,对加速度记录进行能量计算和时频分析发现,该方法不但有效抑制了以往EMD分解过程中所出现的模态混叠问题,而且还较好地提取到记录的时频特性和能量集中分布的时频段。并与Fourier变换、小波分析进行了对比研究证明了该方法在处理非平稳、非线性强震信号中的有效性和实用性,在强震数据处理领域有着较好的应用前景。
April 10, 2011 Sichuan furnace Huo MS5.3 earthquake occurred. In this paper, the time-history records of three-component accelerometers acquired by stations with different epicentral distances in this earthquake are selected. In view of the existing modal aliasing problems in the HHT method using EMD decomposition, a time-frequency characteristic based on EEMD decomposition , The energy calculation and time-frequency analysis of acceleration records show that the proposed method not only effectively suppresses the modal aliasing problems existing in EMD decomposition, but also extracts well the recorded time-frequency characteristics and energy concentration Time-frequency distribution. Compared with Fourier transform and wavelet analysis, it is proved that this method is effective and practical in dealing with non-stationary and nonlinear strong seismic signals and has good application prospect in the field of strong earthquake data processing.