Investigation of Lushan earthquake ionosphere VTEC anomalies based on GPS data  

作　　者：Weiping Jiang Yifang Ma Hongfei Liu Liansheng Deng Xiaohui Zhou 

机构地区：[1]Research Center of GNSS,Wuhan University [2]Administration of Surveying,Mapping and Geoinformation of Yunan Province,Yunan Province Administration of Surveying,Mapping and Geoinformation [3]School of Geodesy and Geomatics,Wuhan University

出　　处：《Earthquake Science》2013年第3期259-265,共7页地震学报（英文版）

基　　金：supported by the National Natural Science Foundation of China(41074022);the National 863 Program of China(2012AA12A209);Open Research Fund Program of Geospace Environment and Geodesy(LOGEG),Ministry of Education,China(No.1202012)

摘　　要：Vertical total electron content （VTEC） time series were obtained from 22 GPS stations near the epicenter of the Lushan earthquake. In this paper, we have adopted a sliding average method to detect and analyze anomalous VTEC associated with the earthquake. The results show that signif- icant, negative ionosphere VTEC anomalies appeared over the 5 days before the earthquake, and on the day when earthquake occurred. The maximum value of VTEC anoma- lies that exceeded the lower bound reached 20 TECU. The spatial distribution of VTEC anomalies showed a conjugate structure, which shifted to the magnetic equator, and subse- quently moved westwards.Vertical total electron content （VTEC） time series were obtained from 22 GPS stations near the epicenter of the Lushan earthquake. In this paper, we have adopted a sliding average method to detect and analyze anomalous VTEC associated with the earthquake. The results show that signif- icant, negative ionosphere VTEC anomalies appeared over the 5 days before the earthquake, and on the day when earthquake occurred. The maximum value of VTEC anoma- lies that exceeded the lower bound reached 20 TECU. The spatial distribution of VTEC anomalies showed a conjugate structure, which shifted to the magnetic equator, and subse- quently moved westwards.

关 键 词：Lushan earthquake Vertical totalelectron content （VTEC） Anomalous perturbationGPS 

分 类 号：P315.72[天文地球—地震学]