基于Hilbert-Huang变换在拜城M_(S)5.4地震中的分析研究  

ANALYSIS AND RESEARCH ON BAICHENG M_(S)5.4 EARTHQUAKE BASED ON HILBERT-HUANG TRANSFORM

作　　者：雷晴 翟世龙[1] 毛玉剑 朱治国[1] LEI Qing;ZHAI Shi-long;MAO Yu-jian;ZHU Zhi-guo(Earthquake Agency of Xinjiang Uygur Autonomous Region,Urumqi 830011,Xinjiang,China)

机构地区：[1]新疆维吾尔自治区地震局,新疆乌鲁木齐830011

出　　处：《内陆地震》2022年第3期265-272,共8页Inland Earthquake

基　　金：2020年新疆维吾尔自治区自然科学基金(2020D01A85);新疆地震科学基金(202006).

摘　　要：基于Hilbert-Huang变换对拜城M_(S)5.4地震波进行分析,探讨Hilbert-Huang变换对乌什台PET型相对重力仪地震波数据的应用。实验首先提取相对重力仪记录到的拜城M_(S)5.4地震波信号,利用HHT变换的EMD对地震波信号进行分解,得出地震波信号EMD分解后的各阶IMF信号。对IMF信号进行频谱分析显示:第1阶到第5阶IMF信号能量与地震波信号能量相对应,表现出地震波蕴含的信息。实验表明:拜城M_(S)5.4地震首波到达的时间为160~185 s;地震波能量集中释放的时间为185~250 s;地震波尾波持续时间为250~345 s。通过HHT频谱实验,精确的表达出拜城M_(S)5.4地震波在不同时间段上的变化形态,清晰展示出地震波在时间、频率和振幅之间的相互关系。Based on the Hilbert-Huang transform,this paper analyzes Baicheng M_(S)5.4 seismic wave,and discusses the application of the Hilbert-Huang change to the seismic wave data of the PET-type relative gravimeter at Wushi Station.The experiment first extracts the Baicheng M_(S)5.4 seismic signal recorded by the relative gravimeter,uses the EMD decomposition of the HHT transform to decompose the seismic wave signal,and obtains the IMF signal of each order after the seismic wave signal EMD decomposition.Through the spectrum analysis of each order IMF signal,it can be obtained that the energy of the first to fifth order IMF signals corresponds to the energy of the original seismic wave signal,showing the information contained in the seismic wave.The experimental results can be showed that the arrival time of the first wave of the Baicheng M_(S)5.4 earthquake is 160~185 s;the time of concentrated release of seismic wave energy is 185~250 s;the duration of the seismic wave coda is 250~345 s.Through the HHT spectrum experiment,it accurately expresses the changes in Baicheng M_(S)5.4 seismic wave in different time periods,and clearly shows the relationship between the time,frequency and amplitude of the seismic wave.

关 键 词：HILBERT-HUANG变换 PET重力观测资料 地震波 频谱分析 

分 类 号：P315.7[天文地球—地震学]