震前电离层TEC异常扰动统计分析  

STATISTICAL ANALYSIS OF PRE-EARTHQUAKE IONOSPHERIC TEC DISTURBANCE

作　　者：祝芙英[1,2] 吴云[1,2] 周义炎[1,2] 林剑[1,2,3] 

机构地区：[1]中国地震局地震研究所,武汉430071 [2]地壳运动与地球观测实验室,武汉430071 [3]武汉大学卫星导航定位技术研究中心,武汉430079

出　　处：《大地测量与地球动力学》2010年第5期19-23,共5页Journal of Geodesy and Geodynamics

基　　金：国家863课题(2007AA12Z169);中国地震局地震研究所所长基金(IS200926039)

摘　　要：利用IGS提供的电离层TEC资料,采用滑动平均方法,对2007年以来全球Ms7.0以上地震进行震前电离层TEC异常扰动研究。统计结果显示:94%的地震的孕震区上空出现了明显的电离层TEC异常扰动,扰动有正有负,而且负的异常扰动多发生在震前一周内,正扰动与时间没有明显的函数关系。It has been proved by a number of researches that the ionospheric anomalous disturbance do appear a few days or hours before earthquake. On the basis of Total Electron Content （TEC） obtained from Internet GPS Service （ IGS）, by use of the method of moving average, the 50 Ms ≥7.0 earthquakes all over the world since January 1,2007 were examined. The statistical results show that, excluding the other possible factors, there were significant ionospheric disturbances including ionospheric anomalous increase and anomalous decrease before the 94% of all the earthquake onset, and the apparent anomalous decrease occurred within 7 days before the earthquake but the anomalous increase is not the function of the time.

关 键 词：地震 总电子含量(TEC) 异常扰动 统计分析 IGS 

分 类 号：P228.4[天文地球—大地测量学与测量工程]