Precursory enhancement of EIA in the morning sector: Contribution from mid-latitude large earthquakes in the north-east Asian region

Kwangsun Ryu, Koh Ichiro Oyama, Ludmil Bankov, Chia Hung Chen, Minakshi Devi, Huixin Liu, Jann Yenq Liu

Research output: Contribution to journalArticle

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Abstract

To investigate whether the link between seismic activity and EIA (equatorial ionization anomaly) enhancement is valid for mid-latitude seismic activity, DEMETER observations around seven large earthquakes in the north-east Asian region were fully analyzed (M⩾6.8). In addition, statistical analysis was performed for 35 large earthquakes (M⩾6.0) that occurred during the DEMETER observation period. The results suggest that mid-latitude earthquakes do contribute to EIA enhancement, represented as normalized equatorial N e , and that ionospheric change precedes seismic events, as has been reported in previous studies. According to statistical studies, the normalized equatorial density enhancement is sensitive and proportional to both the magnitude and the hypocenter depth of an earthquake. The mechanisms that can explain the contribution of mid-latitude seismic activity to EIA variation are briefly discussed based on current explanations of the geochemical and ionospheric processes involved in lithosphere–ionosphere interaction.

Original languageEnglish
Pages (from-to)268-280
Number of pages13
JournalAdvances in Space Research
Volume57
Issue number1
DOIs
Publication statusPublished - Jan 1 2016

Fingerprint

morning
Ionization
Earthquakes
ionization
sectors
earthquakes
DEMETER
anomalies
anomaly
earthquake
augmentation
ionospherics
statistical analysis
Statistical methods
seismic activity
interactions

All Science Journal Classification (ASJC) codes

  • Aerospace Engineering
  • Astronomy and Astrophysics
  • Geophysics
  • Atmospheric Science
  • Space and Planetary Science
  • Earth and Planetary Sciences(all)

Cite this

Precursory enhancement of EIA in the morning sector : Contribution from mid-latitude large earthquakes in the north-east Asian region. / Ryu, Kwangsun; Oyama, Koh Ichiro; Bankov, Ludmil; Chen, Chia Hung; Devi, Minakshi; Liu, Huixin; Liu, Jann Yenq.

In: Advances in Space Research, Vol. 57, No. 1, 01.01.2016, p. 268-280.

Research output: Contribution to journalArticle

Ryu, Kwangsun ; Oyama, Koh Ichiro ; Bankov, Ludmil ; Chen, Chia Hung ; Devi, Minakshi ; Liu, Huixin ; Liu, Jann Yenq. / Precursory enhancement of EIA in the morning sector : Contribution from mid-latitude large earthquakes in the north-east Asian region. In: Advances in Space Research. 2016 ; Vol. 57, No. 1. pp. 268-280.
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