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

研究成果: Article同行評審

12 引文 斯高帕斯(Scopus)

摘要

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.

原文English
頁(從 - 到)268-280
頁數13
期刊Advances in Space Research
57
發行號1
DOIs
出版狀態Published - 2016 一月 1

All Science Journal Classification (ASJC) codes

  • 航空工程
  • 天文和天體物理學
  • 地球物理
  • 大氣科學
  • 空間與行星科學
  • 地球與行星科學(全部)

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