Temporal and spatial characteristics of VTEC anomalies before Wenchuan Ms8.0 earthquake  

作　　者：Fuying Zhu Yun Wu Jian Lin Yiyan Zhou 

机构地区：[1]Institute of Seismology, China Earthquake Administration, Wuhan 430071, China [2]Crustal Movement Laboratory, Wuhan 430071, China [3]Research Center of Wuhan University, Wuhan 430079, China

出　　处：《Geodesy and Geodynamics》2010年第1期23-28,共6页大地测量与地球动力学（英文版）

基　　金：supported by the 863 project of China(2007AA12Z169)

摘　　要：GPS and the COD VTEC data were studied in search of ionospheric VTEC changes in space and time that might be associated with the Wenchuan Ms8.0 earthquake on 12 May,2008. The result shows several significant anomalous decreases at 12：00 UT- 16：00 UT on April 29 and an anomalously increase at 14：00 UT - 18：00 UT on May 9. The anomalies had two humps, that were located on both sides of the geomagnetic equator and had a tendency of drifting towards the equator. Since the observed anomalies cannot be attributed to any other causes and since they occurred close to the time of the earthquake, we consider them to be possibly premonitory to the earthquake.GPS and the COD VTEC data were studied in search of ionospheric VTEC changes in space and time that might be associated with the Wenchuan Ms8.0 earthquake on 12 May,2008. The result shows several significant anomalous decreases at 12：00 UT- 16：00 UT on April 29 and an anomalously increase at 14：00 UT - 18：00 UT on May 9. The anomalies had two humps, that were located on both sides of the geomagnetic equator and had a tendency of drifting towards the equator. Since the observed anomalies cannot be attributed to any other causes and since they occurred close to the time of the earthquake, we consider them to be possibly premonitory to the earthquake.

关 键 词：GPS TEC （ Total Electron Content） ionospheric anomaly Wenchuan Ms8.0 earthquake precurgor 

分 类 号：P315.7[天文地球—地震学] TN911.25[天文地球—固体地球物理学]