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Annales Geophysicae An interactive open-access journal of the European Geosciences Union
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Volume 22, issue 5
Ann. Geophys., 22, 1585–1593, 2004
https://doi.org/10.5194/angeo-22-1585-2004
© Author(s) 2004. This work is distributed under
the Creative Commons Attribution 3.0 License.
Ann. Geophys., 22, 1585–1593, 2004
https://doi.org/10.5194/angeo-22-1585-2004
© Author(s) 2004. This work is distributed under
the Creative Commons Attribution 3.0 License.

  08 Apr 2004

08 Apr 2004

Pre-earthquake ionospheric anomalies registered by continuous GPS TEC measurements

J. Y. Liu2,1, Y. J. Chuo3, S. J. Shan1, Y. B. Tsai4, Y. I. Chen5, S. A. Pulinets6, and S. B. Yu7 J. Y. Liu et al.
  • 1Institute of Space Science, National Central University, Taiwan
  • 2Center for Space and Remote Sensing Research, National Central University, Taiwan
  • 3Department of Information Management, Ling-Tung College, Taiwan
  • 4Institute of Geophysics, National Central University, Taiwan
  • 5Institute of Statistics, National Central University, Taiwan
  • 6Institute of Geophysics, National Autonomous University of Mexico, Mexico
  • 7Institute of Earth Sciences, Academia Sinica, Taiwan

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.

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

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