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Three-Dimensional Tomography of Ionospheric Anomalies Immediately Before the 2015 Illapel Earthquake, Central Chile
| Title: | Three-Dimensional Tomography of Ionospheric Anomalies Immediately Before the 2015 Illapel Earthquake, Central Chile |
| Authors: | He, Liming Browse this author | | Heki, Kosuke Browse this author →KAKEN DB |
| Keywords: | tomography | | Global Navigation Satellite System | | total electron contents | | earthquake | | ionospheric anomaly |
| Issue Date: | May-2018 |
| Publisher: | American Geophysical Union |
| Journal Title: | Journal of geophysical research. Space physics |
| Volume: | 123 |
| Issue: | 5 |
| Start Page: | 4015 |
| End Page: | 4025 |
| Publisher DOI: | 10.1029/2017JA024871 |
| Abstract: | 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 M(w)8.3 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 similar to 200 km and similar to 400 km, respectively, distributed roughly along the geomagnetic field. This feature suggests that the observed anomalies occurred by the downward E x 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. |
| Rights: | Copyright 2018 American Geophysical Union. |
| Type: | article |
| URI: | http://hdl.handle.net/2115/71802 |
| Appears in Collections: | 理学院・理学研究院 (Graduate School of Science / Faculty of Science) > 雑誌発表論文等 (Peer-reviewed Journal Articles, etc)
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Submitter: 日置 幸介
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