基于VMD的地电阻率自适应长期变与年变化提取方法  

A Method for Extracting Adaptive Long-Term and Annual Changes of Apparent Resistivity Based on VMD

作　　者：李鸿宇[1] 杨杰 王丽 孙君嵩 袁桂平[1] LI Hongyu;YANG Jie;WANG Li;SUN Junsong;YUAN Guiping(Jiangsu Earthquake Agency,Nanjing 210014,China)

机构地区：[1]江苏省地震局,南京市210014

出　　处：《大地测量与地球动力学》2024年第11期1173-1178,共6页Journal of Geodesy and Geodynamics

基　　金：江苏省地震局局长科研基金(202201)。

摘　　要：基于VMD技术,结合地电阻率观测数据固有的数字信号特征,通过分析VMD分解后每层IMF分量的中心频率,研究能够提取地电阻率长趋势变化和年周期变化的VMD算法。结果表明,通过判断VMD分解后第2层IMF分量为年变化的方法,可以给出合理的分解层数K;自适应VMD分解有利于震前地电阻率异常识别,尤其是在地电阻率长趋势变化转折时间的确定以及破年变变化的识别方面。Based on variational mode decomposition(VMD)method,combined with the inherent digital signal characteristics of apparent resistivity observation data,we study the VMD algorithm that can extract long-term and annual changes of apparent resistivity by analyzing the center frequency of IMF component in each layer after VMD.The results show that a reasonable decomposition layer K can be given by determining the second layer IMF component after VMD is annual variation.Adaptive VMD is helpful in apparent resistivity anomaly recognition before an earthquake,especially in determining the turning time of long-term changes of apparent resistivity and identifying the annual changes anomaly.

关 键 词：变分模态分解 数字信号处理 地电阻率 长趋势变化 年变化 

分 类 号：P315[天文地球—地震学]