由GPS探测的Sumatra地震前电离层异常研究  

Ionospheric anomalies preceding Sumatra earthquake detected by GPS

作　　者：周长志[1] 张珂[1,2] 张海平[1] 高士民[1] 陈钰[1] 

机构地区：[1]山东省国土测绘院,山东济南250102 [2]山东科技大学测绘科学与工程学院,山东青岛266590

出　　处：《山东理工大学学报（自然科学版）》2017年第4期71-75,共5页Journal of Shandong University of Technology:Natural Science Edition

基　　金：江苏省研究生科研与创新计划项目(KYZZ16_0289)

摘　　要：2016年3月2日苏门答腊发生Mw7.8级地震.为了研究此次地震与电离层的耦合关系,采用欧洲定轨中心提供的Global Ionosphere Map(GIM)数据,利用滑动四分位距法探测了震中的TEC时间序列.在排除太阳与地磁活动的干扰后,结果发现在震前第8d震中地区电子含量明显降低,coco观测站也观测到TEC负异常现象.全球TEC异常分布图显示TEC异常持续约6h,最大幅度达到-6TECU.异常区域主要出现在孕震区内,最大异常区域并不垂直于震中位置,而是出现在靠近赤道异常边界的一侧,但是对应磁共轭区内并无明显TEC异常出现,这可能是Sumatra地震的电离层前兆之一.The Mw7.8 earthquake abruptly occurred in sumatra on March 2nd,2016.In order to investigate the coupling relationship between earthquake and ionospheric variations,the CODE′s（the Center for Orbit Determination in Europe）GIM（global ionosphere map）,the data of coco and pbri stations were analyzed by the sliding interquartile range method.The results indicate that the TEC（total electron content）decreased in the 8rd day before Sumatra earthquake,and the phenomenon was also observed in coco station,after eliminating the ionospheric anomalies associated with solar-terrestrial environment.The distribution of global TEC anomalies showed that the duration of TEC anomalies was about 6 hours with the maximum amplitude of-6TECU,and TEC anomalies mainly occurred in the earthquake preparation zone.The maximum TEC anomalies did not coincide with the epicenter,but appeared in the side close to the bounds of equatorial anomalous area.In addition,no obvious TEC anomalies were observed in the corresponding conjugated region.The phenomena may be the ionospheric precursors of Sumatra earthquake.

关 键 词：电离层异常 SUMATRA 地震 滑动四分位距法 

分 类 号：P228[天文地球—大地测量学与测量工程]