河北尚义M4.0地震加速度记录时频特性分析

2016年6月23日，河北张家口尚义县发生M 4.0地震，发震构造为尚义-平泉断裂。采用基于聚类经验模态分解（EEMD）的HHT计算方法，对尚义M4.0地震强震动记录进行EEMD分解、Hilbert谱变换及谱分析，得到强震动台站的加速度记录分量的时程、FFT谱和边际谱、瞬时能量谱及时频谱，对比分析并认识各种谱的时频特性及规律，做好灾前预防工作，以减少人民生命财产损失。

Analysis of time-frequency characteristics of Seismic acceleration records of Shangyi M4.0 earthquake in Hebei Province

On June 23, 2016, an M4.0 earthquake occurred in Shangyi County, Zhangjiakou, Hebei Province. The seismogenic structure was Shangyi-Pingquan fault. In this paper, a HHT calculation method based on ensemble empirical mode decomposition (EEMD) is used to analyze the EEMD decomposition Hilbert spectrum of the strong motion record of Shangyi M4.0 earthquake. The time-history and marginal spectra of the acceleration record component of the strong seismic station are obtained. The instantaneous energy spectrum is in time frequency spectrum. The time-frequency characteristics of all kinds of spectra are compared and studied, and their laws are recognized, in order to do a better job for pre-disaster prevention and reduce the live and property loss of people.