DOI: 10.1029/2017JA024871
Scopus记录号: 2-s2.0-85046289678
论文题名: Three-Dimensional Tomography of Ionospheric Anomalies Immediately Before the 2015 Illapel Earthquake, Central Chile
作者: He L. ; Heki K.
刊名: Journal of Geophysical Research: Space Physics
ISSN: 21699380
出版年: 2018
卷: 123, 期: 5 起始页码: 4015
结束页码: 4025
语种: 英语
英文关键词: earthquake
; Global Navigation Satellite System
; ionospheric anomaly
; tomography
; total electron contents
英文摘要: Using ionospheric total electron contents residual data from 146 Global Navigation Satellite System stations in South America, we conducted three-dimensional tomography of ionospheric electron density anomalies immediately before the 2015 Illapel Mw8.3 earthquake, Central Chile. We used five GPS and five GLONASS satellites and applied continuity constraints to regularize the linear least squares inversion. The reconstructed anomalies are composed of positive and negative regions, at altitudes of ~200 km and ~400 km, respectively, distributed roughly along the geomagnetic field. This feature suggests that the observed anomalies occurred by the downward E × B drift of electrons due to electric fields within ionosphere, possibly caused by surface positive electric charges. We also discuss the existence of the mirror image anomalies near the geomagnetic conjugate point of the epicenter using stations in Colombia. ©2018. American Geophysical Union. All Rights Reserved. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/113921
Appears in Collections: 气候减缓与适应
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作者单位: Department of Geodesy and Geomatics, School of Resources and Civil Engineering, Northeastern University, Shenyang, China; Department of Earth and Planetary Sciences, Hokkaido University, Sapporo, Japan
Recommended Citation:
He L.,Heki K.. Three-Dimensional Tomography of Ionospheric Anomalies Immediately Before the 2015 Illapel Earthquake, Central Chile[J]. Journal of Geophysical Research: Space Physics,2018-01-01,123(5)