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Pre-earthquake ionospheric anomalies registered by continuous GPS TEC measurements

Abstract : 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.
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https://hal.archives-ouvertes.fr/hal-00317335
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Submitted on : Thursday, April 8, 2004 - 8:00:00 AM
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  • HAL Id : hal-00317335, version 1

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J. Y. Liu, Y. J. Chuo, S. J. Shan, Y. B. Tsai, Y. I. Chen, et al.. Pre-earthquake ionospheric anomalies registered by continuous GPS TEC measurements. Annales Geophysicae, European Geosciences Union, 2004, 22 (5), pp.1585-1593. ⟨hal-00317335⟩

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