Pre-earthquake ionospheric anomalies registered by continuous GPS TEC measurements

Liu, J. Y.; Chuo, Y. J.; Shan, S. J.; Tsai, Y. B.; Chen, Y. I.; Pulinets, S. A.; Yu, S. B.

In this paper we examine pre-earthquake ionospheric anomalies by the total electron content (TEC) derived from a ground-based receiver of the Global Positioning System (GPS). A 15-day running median of the TEC and the associated inter-quartile range (IQR) are utilized as a reference for identifying abnormal signals during all of the 20M≥6.0 earthquakes in the Taiwan area from September 1999 to December 2002. Results show that the pre-earthquake ionospheric anomalies appear during 18:00–22:00LT (LT=UT+8h) within 5 days prior to 16 of the 20M≥6.0 earthquakes. This success rate of 80% (=16/20%) suggests that the GPS TEC is useful to register pre-earthquake ionospheric anomalies appearing before large earthquakes.

Key words. Ionosphere (ionospheric disturbances; ionosphere-atmosphere interactions)

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Liu, J. Y. / Chuo, Y. J. / Shan, S. J. / et al: Pre-earthquake ionospheric anomalies registered by continuous GPS TEC measurements. 2004. Copernicus Publications.

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