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《Chinese Journal of Radio Science》 2009-01
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Electromagnetic perturbations before Wenchuan M8 earthquake and stereo electromagnetic observation system

ZHANG Xue-min1 DING Jian-hai1 SHEN Xu-hui1 WANG Min1 LIU Jing1 YU Su-rong2 WANG Ya-li2 OUYANG Xin-yan1(1.Institute of Earthquake Science,CEA,Beijing 100036,China;2.China Earthquake Networks Center,CEA,Beijing 100045,China)  
Middle-term,imminent anomalies observed in geoelectrical and geomagnetic and ionospheric detecting before Wenchuan M8.0 earthquake in Sichuan Province,on May 12th 2008,are studied and analyzed.Earth resistivity at Pixian station nearest to the epicenter showed a decreasing trend of 2 years with the reducing amplitude of 7.2%.At the meantime,earth resistivity at some stations exhibited short-term abrupt anomalies a month prior to the earthquake.Low point displacement of geomagnetic vertical component occurred 18 days before the event,in which the low point time at two sides of dividing boundary exceeded 2 hours.On May 9,3 days before the earthquake,many local electromagnetic perturbations were detected by geomagnetic low point displacement,total electron concentration(TEC)inversed by GPS observation,foF2 obtained by ionospheric sounding and ion density and temperature detected by electromagnetic satellite,with most amplitude exceeding 50%.These apparent anomalies recorded by kinds of electromagnetic observation technology before Wenchuan M8 earthquake reveals great potentialities of electromagnetic subject in the field of earthquake prediction,and it is necessary to enhance stereo electromagnetic observation by space-ground integration for improving the level of earthquake prediction.
【Fund】: 国家科技支撑项目(2008BAC35B01、2006BAC011302-04-02);; 中国地震局地震预测研究所基本科研业务经费联合资助
【CateGory Index】: P315.721
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