The ionospheric perturbations prior to the Chi-Chi and Chia-Yi earthquakes

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

Research output: Contribution to journalArticlepeer-review

35 Scopus citations


In this paper we analyze the greatest plasma frequency, foF2, named critical frequency, observed by the Chung-Li ionosonde (25.0°N, 121.1°E) during the period of the Chi-Chi (23.87°N, 1 20.75°E) and the Chia-Yi (23.51°E, 120.4°E) earthquakes. The previous 15-day running mean and the associated standard deviation are utilized to construct the upper or lower bound for detecting the seismo-ionospheric perturbations. It is found that the perturbation appeals in 3-4 days prior to the Chi-Chi earthquake as well as 1-3 days prior to the Chia-Yi earthquake.

Original languageEnglish
Pages (from-to)509-517
Number of pages9
JournalJournal of Geodynamics
Issue number4-5
StatePublished - 2002


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