2016-12-25智利M_W7.6地震震前电离层TEC异常探测  

Detection of Ionospheric TEC Anomaly before Chile M_W7.6 Earthquake on December 25,2016

作　　者：史坤朋 郭金运[1,2] 刘智敏[1,2] 李旺[3] SHI Kunpeng;GUO Jinyun;LIU Zhimin;LI Wang(College of Geodesy and Geomatics,Shandong University of Science and Technology,579 Qianwangang Road,Qingdao 266590,China;State Key Laboratory of Mining Disaster Prevention and Control Cofounded by Shandong Province and Ministry of Science&Technology,Shandong University of Science and Technology,579 Qianwangang Road,Qingdao 266590,China;College of Earth Science and Engineering,Hohai University,8 West-Focheng Road,Nanjing 211100,China)

机构地区：[1]山东科技大学测绘科学与工程学院,青岛市前湾港路579号266590 [2]山东科技大学矿山灾害预防控制省部共建国家重点实验室,青岛市前湾港路579号266590 [3]河海大学地球科学与工程学院,南京市佛城西路8号211100

出　　处：《大地测量与地球动力学》2018年第9期979-985,共7页Journal of Geodesy and Geodynamics

基　　金：国家自然科学基金(41374009;41774001);国家科技部科技基础性工作专项(2015FY310200);山东科技大学科研创新团队支持计划(2014TDJH101)~~

摘　　要：使用IGS发布的GIM数据,利用奇异谱(singular spectrum analysis,SSA)和四分位距法(inter quartile range,IQR)对2016-12-25智利MW7.6地震进行震前电离层异常探测。研究表明,2种方法探测到的电离层主要异常特征基本一致,在震前4d和震前7d分别探测到明显的正异常和负异常,电离层异常自东向西移动,峰值点出现在震中附近,且震前4d共轭区域出现明显的电离层正异常变化。相较于IQR探测,SSA探测突出了电离层主要的异常时间段和空间异常特征,但幅度和范围偏小,两者互为补充,可以探测出更加明显的地震电离层异常效应特征。由于距发震时间较短,在排除外界环境干扰因素后,认为此次电离层异常可能由智利地震引起。The GPS derived global ionosphere map(GIM)by international GNSS service is used to analyze the impending ionospheric anomalies before the M W7.6 earthquake in Chile on December 25,2016.The singular spectrum analysis(SSA)and sliding inter quartile range(IQR)method are used to detect the ionospheric anomaly preceding great earthquake,respectively.The results show the main feature of ionosphere anomalies detected by the two methods are basically the same.There are significant positive anomalies and negative anomalies on the 4th and 7th day prior to the earthquake,respectively.The ionospheric anomalies had the movement tendency from east to west in the two days,with its peak points appearing near the epicenter.The positive TEC anomalies had also been found in the conjugate area 4 days before earthquake.Compared to IQR detection,although the SSA detection highlights the main anomalous periods and spatial anomaly feature of the ionosphere,the TEC abnormal amplitude and range are smaller at the same time.Therefore,we can combine with two methods to detect the more obvious characteristics of seismic-ionospheric coupling effect.Due to the closer time to the moment of the earthquake occurrence,the results show that the ionospheric anomalies are possibly related to the earthquake,excluding other possible factors.

关 键 词：智利地震 电离层异常 奇异谱分析 四分位距法 GIM 

分 类 号：P228[天文地球—大地测量学与测量工程] P315[天文地球—测绘科学与技术]