顾及信号振荡特征的慢滑移信息时空提取  

Spatiotemporal extraction of slow slip information considering signal oscillation characteristics

作　　者：侯争[1] 郭增长[1,2] 杜久升 HOU Zheng;GUO Zengzhang;DU Jiusheng(School of Surveying and Land Information Engineering,Henan Polytechnic University,Jiaozuo,Henan 454003,China;Henan College of Surveying and Mapping,Zhengzhou 451464,China)

机构地区：[1]河南理工大学测绘与国土信息工程学院,河南焦作454003 [2]河南测绘职业学院,郑州451464

出　　处：《导航定位学报》2024年第5期44-54,共11页Journal of Navigation and Positioning

基　　金：国家自然科学基金项目(41774041);河南省科技攻关项目(232102321004,212102310436)。

摘　　要：针对传统滤波和固定函数拟合等方法探测慢滑移信号时易产生信息误剔除或伪信号提取等问题,提出一种基于信号振荡特征的慢滑移时空信息探测方法:利用多通道奇异谱分析分解坐标序列;然后根据慢滑移位移特征确定信号的起止时间;最后基于信号的振荡方向和振幅归一化明确空间响应方向和强度。仿真结果表明,相较于主成分分析和独立成分分析,该方法在探测慢滑移起止时间、空间响应方向和强度等方面优势明显:实际应用中,利用该方法成功探测出新西兰马纳瓦图的慢滑移事件,测站WANG和PNUI连线两侧的空间响应方向相反,强度大,地震危险性高;而独立成分分析和主成分分析探测到的空间响应可能受到共模误差影响,时间响应也无法明确慢滑移起止时间。Aiming at the problem of the false information removal or false signal extraction using the traditional filtering and fixed function fitting methods in detection of slow slip signals,the paper proposed a method for detecting slow slip spatiotemporal information based on signal oscillation characteristics:the coordinate sequence was decomposed by multi-channel singular spectrum analysis;and then the signal properties and start-end time were determined according to the displacement characteristics of slow slip;finally,the direction and intensity of the spatial response were determined based on the oscillation direction and the amplitude normalization of the signal.Simulational results showed that the proposed method would have obvious advantages in detecting the start-end time,spatial response direction and signal intensity of slow slip compared with principal component analysis and independent component analysis;moreover,in practice,the method had been successfully used to detect the slow slip event in Manawatu,New Zealand,where the spatial responses on both sides of the line between the station WANG and PNUI were opposite in directions,and the intensity was large,which could lead to a high seismic risk,however,the spatial responses detected by independent component analysis and principal component analysis might be affected by common mode errors,and the start-end time of slow slip could not be determined by time responses.

关 键 词：多通道奇异谱分析 慢滑移 独立成分分析 谱指数 全球定位系统(GPS) 

分 类 号：P227[天文地球—大地测量学与测量工程] P228.4[天文地球—测绘科学与技术]