Ionospheric foF2 and TEC anomalous days associated with M≥5.0 earthquakes in Taiwan during 1997-1999

Jann Yenq Liu, Yuh Ing Chen, Hau Kun Jhuang, Yu Hsiang Lin

Research output: Contribution to journalArticlepeer-review

81 Scopus citations

Abstract

In this paper, we examine variations in the critical frequency foF2 recorded by an ionosonde, and the total electron content (TEC) derived from a network of 5 ground-based receivers of the global positioning system (GPS), as well as occurrences of 144 M ≥ 5.0 earthquakes in Taiwan during 1997 - 1999. Results show that the foF2 and TEC yield similar tendencies, and often concurrently register pronounced decrease anomalies 4 days before the earthquakes. A detailed investigation of anomalies appearing before and after the earthquakes confirms significant decreases in the FoF2 and TEC to be the pre-earthquake anomalies.

Original languageEnglish
Pages (from-to)371-383
Number of pages13
JournalTerrestrial, Atmospheric and Oceanic Sciences
Volume15
Issue number3
DOIs
StatePublished - Sep 2004

Keywords

  • Earthquake
  • GPS
  • Global positioning system
  • Ionosonde
  • Ionosphere
  • TEC
  • Total electron content

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