Ionospheric total electron content disturbance associated with May 12, 2008,Wenchuan earthquake  

作　　者：Li Jianyong Meng Guojie You Xinzhao Zhang Rui Shi Hongbo Han Yufei 

机构地区：[1]National Earthquake Infrastructure Service [2]State Key Laboratory of Geodesy and Earth's Dynamics, Institute of Geodesy and Geophysics,Chinese Academy of Sciences [3]Institute of Earthquake Science, China Earthquake Administration

出　　处：《Geodesy and Geodynamics》2015年第2期126-134,共9页大地测量与地球动力学（英文版）

基　　金：supported financially by Science for Earthquake Resilience(XH14064Y);the open foundation of the State Key Laboratory of Geodesy and Earth's Dynamics(SKLGED2014-5-2-E)

摘　　要：Possible ionospheric disturbances relating to the May 12, 2008, MsS.0 Wenchuan earthquake were identified by Global Positioning System （GPS）-derived total electron content （TEC）, ion- osonde observations, the global ionospheric map （GIM）, and electron density profiles detected by the Constellation Observation System for Meteorology Ionosphere and Climate （COSMIC）. We applied a statistical test to detect anomalous TEC signals and found that a unique enhancement in TEC, recorded at 16 GPS stations, appeared on May 9, 2008. The critical fre- quency at F2 peak （foF2）, observed by the Chinese ionosondes, and maximal plasma frequency, derived from COSMIC data, revealed a characteristic similar to GPS TEC variations. The GIM showed that the anomalous variations of May 9 were located southeast of the epicenter. Using GPS data from 13 stations near the epicenter, we analyzed the TEC variations of satellite orbit traces during 04：00-11：00 UT. We found that TEC decreased to the east and increased to the southeast of the epicenter during this period. Results showed that the abnormal disturbance on May 9 was probably an ionosphenc precursor of the Wenchuan earthquake of May 12, 2008.Possible ionospheric disturbances relating to the May 12, 2008, MsS.0 Wenchuan earthquake were identified by Global Positioning System （GPS）-derived total electron content （TEC）, ion- osonde observations, the global ionospheric map （GIM）, and electron density profiles detected by the Constellation Observation System for Meteorology Ionosphere and Climate （COSMIC）. We applied a statistical test to detect anomalous TEC signals and found that a unique enhancement in TEC, recorded at 16 GPS stations, appeared on May 9, 2008. The critical fre- quency at F2 peak （foF2）, observed by the Chinese ionosondes, and maximal plasma frequency, derived from COSMIC data, revealed a characteristic similar to GPS TEC variations. The GIM showed that the anomalous variations of May 9 were located southeast of the epicenter. Using GPS data from 13 stations near the epicenter, we analyzed the TEC variations of satellite orbit traces during 04：00-11：00 UT. We found that TEC decreased to the east and increased to the southeast of the epicenter during this period. Results showed that the abnormal disturbance on May 9 was probably an ionosphenc precursor of the Wenchuan earthquake of May 12, 2008.

关 键 词：Ionospheric disturbance Global positioning system （GPS） Total electron content （TEC） Wenchuan earthquake Global ionospheric map （GIM） COSMIC F0F2 Crustal Movement Observation Network of China （CMONOC） 

分 类 号：P315.728[天文地球—地震学] P228.4[天文地球—固体地球物理学]