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《Crustal Deformation and Earthquake》 2005-02
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PRESEISMIC IONOSPHERIC TEC ANOMALY DETECTED BY GROUND-BASED GPS

Wu Yun+{1,2,3)},Qiao Xuejun+{1,2,3)} and Zhou Yiyan+{1,2,3)} 1)Institute of Seismology,CEA,Wuhan430071 2)Wuhan Base of Institute of Crustal Dynamics,CEA,Wuhan430071 3)Crustal Movement Laboratory,Wuhan430071  
Utilizing the VTEC data obtained by ground-based GPS and adopting statistical analysis method, we examined the VTEC before three strong earthquakes in Asia. As a result, we found the anomalous VTEC disturbances over seismic preparation zone, which took place ten days before the events:at the begining,the VTEC was increesing and then decreasing.We suggest that the increase which occured in the time far from the moment when the earthquake burst out may be related to the enhencement of Solar or geo-magnetic activity and the decrease which were close to the earthquake moment,so it can basically ,be thought as the ionosphre effect caused by quake.
【Fund】: “863”课题:中国地震科学卫星计划的预研与制定(2003AA134060)
【CateGory Index】: P315.722
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