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

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。

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.