基于GPS电离层层析技术的地震电离层异常研究  

Investigation of Ionospheric Anomalies Based on GPS Ionospheric Technology in Earthquakes

作　　者：刘莹[1,2] 章文毅[1] 戴吾蛟[3] 陈必焰[3] 

机构地区：[1]中国科学院遥感与数字地球研究所,北京市邓庄南路9号100094 [2]中国科学院大学,北京市玉泉路甲19号100049 [3]中南大学测绘与国土信息工程系,长沙市麓山南路932号410083

出　　处：《大地测量与地球动力学》2015年第2期287-292,共6页Journal of Geodesy and Geodynamics

基　　金：国家863计划(2012AA12A301)

摘　　要：采用电离层层析成像技术（CIT）研究日本、苏门答腊岛、中国台湾、新疆地区上空不同震级地震前后的电离层三维分布。利用异常探测方法对反演出的电子密度值进行探测并用统计学方法统计地震电离层异常规律,结论如下：1）在地震前几天或者前几个小时出现电离层明显异常,尤其是在地震前1～2d震中附近,排除太阳活动和地球磁场影响,初步认为该异常与地震有关;2）电离层电子密度出现异常区域一般涵盖震中区域,与震中位置有少量偏移,而且离震中区域越近,电离层异常变化越大;3）未发现正、负异常的比例与地震之间有明确的对应关系。In our paper,we use ionospheric tomography technology,which was proposed by Austen et al.in 1986,to detect a three-dimensional map of ionosphere over the epicenters of different magnitude earthquakes in Japan,Sumatra,Taiwan and Xinjiang China.We use the anomaly detection method to detect the electron density anomies and analyze earthquake ionospheric anomaly statistics.It is concluded that：1）There are distinct ionospheric abnormalities in a few days or a few hours before the earthquake,especially in the 1-2 days before the earthquake near the epicenter.The earthquake accounts for the anomalies,with the exception of effects from solar activity and terrestrial magnetic field.2）The abnormal ionospheric electron density area is generally near the epicenter,with a small offset from the epicenter.The closer to the epicenter,the greater the ionospheric anomaly.3）The convincing functional relationship between negative or positive anomalies and earthquakes is not found yet.

关 键 词：地震 电离层异常 层析 GPS 

分 类 号：P228.42[天文地球—大地测量学与测量工程]