Pre-earthquake ionospheric anomalies using ground-based GPS observations
Based on the single layer ionosphere model, we have processed the continuous GPS data from a network of 25 ground-based receivers of the GPS in China and obtained the time series of variations of ionospheric total electron content (TEC). We have studied the TEC anomalies of 12 earthquakes (M≥6.0) which occurred in Chinese mainland during 2001-2008. The results show that the TEC values above the GPS stations located 700 km away from the epicenter have no obvious anomalies before and after earthquakes, and △TEC variation is within 0.3 TECU. There are 6 times ionospheric anomalies within 9 earthquakes that the distance between the epicenter and GPS station (DEG) is less than 700 km. TEC anomalies appear mainly 1-5 days before earthquakes, and TEC anomalies are proportion to DEG. During a few earthquakes, TEC values were increased significantly. The research results show that it is possible to identify pre-earthquakes ionospheric anomalies from continuous GPS observation data.
Pre-earthquake anomaly Ionospheric precursor GPS total electron content (TEC)
MENG Guojie WANG Min MA Xinxin SUO Yucheng JIN Honglin
Institute of Earthquake Science, China Earthquake Administration, Beijing, China; Institute of Earthquake Science, China Earthquake Administration, Beijing, China;Beijing National Ob Chengdu University of Technology, Chengdu, China The 22nd Research Institute of China Electronics Technology Group Corporation Institute of Earthquake Science, China Earthquake Administration, Beijing, China
国际会议
The 19th International Workshop on Electromagnetic Induction in the Earth(第十九届国际地球电磁感应学术研讨会)
北京
英文
873-878
2008-10-23（万方平台首次上网日期，不代表论文的发表时间）