三种变换在强震记录分析方面的研究
APPLICATION OF THREE TRANSFORMATIONS IN THE ANALYSIS OF IN STRONG EARTHQUAKE RECORDS
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摘要: 在简要地介绍比较了傅立叶变换、小波变换、希尔伯特-黄变换理论的基础上, 针对集集地震大量强震记录进行各种变换分析比较, 以探求希尔伯特-黄变换在强震记录分析中应用的前景。通过对集集地震60条不同震中距和场地的强震纪录, 分别作傅立叶频谱、希尔伯特-黄边际谱和能量密度谱分析, 列表归纳对比显示希尔伯特-黄变换在强震记录处理中基本表现出和其他变换相同的趋势, 并有其新特点, 能体现出强地震动的瞬时特性, 是对现有强震数据处理方法重要的补充。Abstract: Based on the analysis to Fourier, Wavelet and Hilbert-Huang Transform, the application of Hilbert-Huang Transform in the analysis of strong earthquake records is discussed with 60 strong aftershocks in Jiji earthquake series.The results show that Hilbert-Huang Transform not only has the same function of other transformations, but has its own new feature, which can reflect the instantaneous characteristic of strong motion.
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