Seismo-ionospheric signatures prior to M ≥ 6.0 Taiwan earthquakes

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

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Abstract

This paper examines variations of the greatest plasma frequency in the ionosphere, foF2, recorded by the Chung-Li ionosonde (25.0°N, 121.1°E) before M≥6.0 earthquakes during 1994-1999. The 15-day running median and the associated inter-quartile range are utilized as the reference and the upper or lower bounds to monitor the ionospheric foF2 variations for finding seismo-ionospheric signatures (precursors) of the earthquakes. It is found that precursors, in the form of the recorded foF2 falling below its associated lower bound around 1200-1700 LT, appear 1-6 days prior to these earthquakes. On September 20, 1999 UT (September 21, Taiwan local time) a large Mw=7.7 earthquake struck central Taiwan near the small town of Chi-Chi. We analyzed the foF2 and found three clear precursors 1, 3, and 4 days prior to the Chi-Chi earthquake.

Original languageEnglish
Pages (from-to)3113-3116
Number of pages4
JournalGeophysical Research Letters
Volume27
Issue number19
DOIs
StatePublished - 2000

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