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

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题名:	Precursory enhancement of EIA in the morning sector: Contribution from mid-latitude large earthquakes in the north-east Asian region
作者:	劉正彥;Ryu, Kwangsun;Oyama, Koh-Ichiro;Bankov, Ludmil;Chen, Chia-Hung;Devi, Minakshi;Liu, Huixin;Liu, Jann-Yenq
贡献者:	地球科學學院太空科學與工程學系
关键词:	Asian;Density;Earthquake precursor;Earthquakes;Equatorial ionization anomaly;Equatorial regions;Geochemistry;Ionospherics;Morning;Seismic phenomena;Seismo-ionospheric coupling
日期:	2016-01-01
上传时间:	2026-04-23 11:05:42 (UTC+8)
出版者:	Elsevier Ltd.;Elsevier Ltd
摘要:	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 Ne, 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. 出版者： Elsevier Ltd 出版日期： 2016-01-01 出處： Advances in Space Research, 2016-01, Vol.57 (1), p.268-280 資源來源： Elsevier ScienceDirect Journals Complete 版權： 2015 COSPAR 識別號： ISSN: 0273-1177 識別號： EISSN: 1879-1948 識別號： DOI: 10.1016/j.asr.2015.08.030
显示于类别:	[太空科學與工程學系] 期刊論文

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