Siesmo-ionospheric precursors of the 26 December 2006 M 7.0 Pingtung earthquake doublet

Jann Yenq Liu, Sen Wen Chen, Yao Chun Chen, Horng Yuan Yen, Chung Pai Chang, Wen Yen Chang, Lung Chih Tsai, Chia Hung Chen, Wen Hsi Yang

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A network of ground-based GPS receivers, an ionosonde, and a Doppler sounding system have been employed to monitor the total electron content (TEC), electron density, and vertical motion of the ionosphere above Taiwan. Two M 7.0 offshore earthquakes occurred near Pingtung, the most southern county of Taiwan, on 26 December 2006. Analysis has revealed that the ionospheric TEC and F2-pear electron density (NmF2) surrounding the epicenters of the events decreased abnormally in the afternoon of the fourth day before the earthquakes, and quasi 3-minute fluctuations of pronounced vertical motion in the ionosphere also appeared over the last two days prior to the earthquakes. This is for the first time the pre-earthquake fluctuation signatures in the ionosphere being reported.

Original languageEnglish
Pages (from-to)751-759
Number of pages9
JournalTerrestrial, Atmospheric and Oceanic Sciences
Issue number6
StatePublished - Dec 2008


  • Doppler sounding system
  • Ionosphere
  • NmF2
  • Seismo-ionospheric precursor
  • Total electron content


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