Ionospheric foF2 variations prior to strong earthquakes in Taiwan area

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

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26 Scopus citations

Abstract

Many studies of the seismo-ionospheric coupling effects have been reported. On 17 July 1998(M=6.2), 20 September 1999 (M=7.3) and 22 October 1999 (M=6.4) three large earthquakes respectively struck Rei-Li, Chi-Chi and Chia-Yi in central Taiwan. The three earthquakes severely damaged structures, heavily changed landforms and disturbed geophysical environments. This paper examines variations of the ionospheric penetration frequency, foF2, observed by Chung-Li ionosonde station (25.0° N, 121.1° E) several days before the three earthquakes. The mean- and median-based statistical techniques are introduced to investigate the ionospheric electron density prior to the three earthquakes. Results show that the foF2 decrease significantly before the three earthquakes.

Original languageEnglish
Pages (from-to)1305-1310
Number of pages6
JournalAdvances in Space Research
Volume27
Issue number6-7
DOIs
StatePublished - 2001

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