利用小波变换提取川滇地区流动重力异常特征——以2014年鲁甸M_S6.5、景谷M_S6.6地震为例  

The Anomaly Feature Extraction of Mobile Gravity in the Sichuan-Yunnan Region Using Wavelet Transform Method ——The Case Study of the Ludian M_S6.5 and Jinggu M_S6.6 Earthquakes in 2014

作　　者：张双喜[1] 陈兆辉[1] 王青华[2] 刘金钊[1] 张品[1] ZHANG Shuangxi;CHEN Zhaohui;WANG Qinghua;LIU Jinzhao;ZHANG Pin(The First Monitoring and Application Center,CEA,7 Naihuo Road,Tianjin 300180,China;Deformation Survey Center of Yunnan Earthquake Agency,249 Zhichun Street,Kunming 650041,China)

机构地区：[1]中国地震局第一监测中心,天津市300180 [2]云南省地震局形变测量中心,昆明市650041

出　　处：《大地测量与地球动力学》2020年第1期87-93,共7页Journal of Geodesy and Geodynamics

基　　金：中国地震局震情跟踪定向工作任务(2019010208);中国地震局地震科技星火计划(XH17058Y);国家自然科学基金(41704084)~~

摘　　要：首先介绍小波变换的基本原理,分析影响小波多分辨率分解效果的因素,提出选择coif5小波基函数、交叉验证确定分解阶次的小波多尺度分解方法;然后在模型实验中利用该方法对模型局部和区域异常实现有效分离,并结合径向对数功率谱方法对分解重构异常进行定性、半定量分析;最后对川滇地区201309~201404期流动重力差分动态变化异常进行多尺度分解。在分解得到的D4~D 6异常、重构的局部和区域异常中,2014年鲁甸MS6.5和景谷MS6.6地震主震位置均存在明显的异常变化特征。结合地质构造背景信息对该异常特征进行分析解释。In this paper,firstly,we introduce the basic principle of the wavelet transform,discuss and analyze the influence factors of the wavelet multi-resolution decomposition and the wavelet multi-scale decomposition method,select the wavelet basic function of coif5,and propose determining the decomposition order by cross examination method.Secondly,we use this method to effectively separate the local and regional anomalies in the model test,and analyze the reconstruction anomalies qualitatively and semi-quantitatively,combining with the radial logarithmic power spectrum method.Lastly,the wavelet transform is applied to deal with the mobile gravity anomalies of differential dynamic variations of the period of 201309-201404 in the Sichuan-Yunnan region,so as to obtain the multi-scale decomposition anomalies.Furthermore,we find obvious gravity anomalies variation characteristics among D4-D6 anomalies by the wavelet transform,the reconstructed local and regional anomalies in the main earthquake location of Ludian MS6.5 and Jinggu MS6.6 earthquakes in 2014.The above anomalies are analyzed and explained in combination with the information of geological structures in this area.

关 键 词：小波变换 川滇地区 异常特征提取 径向对数功率谱 鲁甸地震、景谷地震 

分 类 号：P312[天文地球—固体地球物理学] P315[天文地球—地球物理学]