A statistical investigation of preearthquake ionospheric anomaly

J. Y. Liu, Y. I. Chen, Y. J. Chuo, C. S. Chen

Research output: Contribution to journalArticlepeer-review

252 Citations (Scopus)


Empirical evidence of the preearthquake ionospheric anomalies (PEIAs) is reported by statistically investigating the relationship between variations of the plasma frequency at the ionospheric F2 peak foF2 and 184 earthquakes with magnitude M ≥ 5.0 during 1994-1999 in the Taiwan area. The PEIA, defined as the abnormal decrease more than about 25% in the ionospheric foF2 during the afternoon period, 1200-1800 LT, significantly occurs within 5 days before the earthquakes. Moreover, the odds of earthquakes with PEIA increase with the earthquake magnitude but decrease with the distance from the epicenter to the ionosonde station. These results indicate that the PEIA is energy related.

Original languageEnglish
Article numberA05304
JournalJournal of Geophysical Research: Space Physics
Issue number5
Publication statusPublished - 2006 May 1

All Science Journal Classification (ASJC) codes

  • Geophysics
  • Forestry
  • Oceanography
  • Aquatic Science
  • Ecology
  • Water Science and Technology
  • Soil Science
  • Geochemistry and Petrology
  • Earth-Surface Processes
  • Atmospheric Science
  • Earth and Planetary Sciences (miscellaneous)
  • Space and Planetary Science
  • Palaeontology

Fingerprint Dive into the research topics of 'A statistical investigation of preearthquake ionospheric anomaly'. Together they form a unique fingerprint.

Cite this