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| Investigation of Lushan earthquake ionosphere VTEC anomalies based on GPS data |
| Weiping Jiang1, Yifang Ma1, Hongfei Liu2, Liansheng Deng3, Xiaohui Zhou3 |
1 Research Center of GNSS, Wuhan University, Wuhan 430079, China
2 Administration of Surveying, Mapping and Geoinformation of Yunan Province, Yunan Province Administration of Surveying, Mapping and Geoinformation, Kunming 650033, China
3 School of Geodesy and Geomatics, Wuhan University, Wuhan 430079, China |
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Abstract Vertical total electron content (VTEC) time series were obtained from 22 GPS stations near the epicenter of the Lushan earthquake. In this paper, we have adopted a sliding average method to detect and analyze anomalous VTEC associated with the earthquake. The results show that significant, negative ionosphere VTEC anomalies appeared over the 5 days before the earthquake, and on the day when earthquake occurred. The maximum value of VTEC anomalies that exceeded the lower bound reached 20 TECU. The spatial distribution of VTEC anomalies showed a conjugate structure, which shifted to the magnetic equator, and subsequently moved westwards.
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Received: 14 June 2013
Published: 20 November 2013
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| Fund:the National Natural Science Foundation of China (41074022), the National 863 Program of China (2012AA12A209) and Open Research Fund Program of Geospace Environment and Geodesy (LOGEG), Ministry of Education, China (No. 1202012) |
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Corresponding Authors:
Yifang Ma
E-mail: csumyf2008@126.com
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