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Three-dimensional distribution of ionospheric anomalies prior to three large earthquakes in Chile
| Title: | Three-dimensional distribution of ionospheric anomalies prior to three large earthquakes in Chile |
| Authors: | He, Liming Browse this author | | Heki, Kosuke Browse this author →KAKEN DB |
| Keywords: | strong earthquake | | preseismic ionospheric anomaly | | three-dimensional spatial structure | | Global Positioning System | | total electron content |
| Issue Date: | 29-Jul-2016 |
| Publisher: | American Geophysical Union |
| Journal Title: | Geophysical research letters |
| Volume: | 43 |
| Issue: | 14 |
| Start Page: | 7287 |
| End Page: | 7293 |
| Publisher DOI: | 10.1002/2016GL069863 |
| Abstract: | Using regional Global Positioning System (GPS) networks, we studied three-dimensional spatial structure of ionospheric total electron content (TEC) anomalies preceding three recent large earthquakes in Chile, South America, i.e., the 2010 Maule (M-w 8.8), the 2014 Iquique (M-w 8.2), and the 2015 Illapel (M-w 8.3) earthquakes. Both positive and negative TEC anomalies, with areal extent dependent on the earthquake magnitudes, appeared simultaneously 20-40min before the earthquakes. For the two midlatitude earthquakes (2010 Maule and 2015 Illapel), positive anomalies occurred to the north of the epicenters at altitudes 150-250km. The negative anomalies occurred farther to the north at higher altitudes 200-500km. This lets the epicenter, the positive and negative anomalies align parallel with the local geomagnetic field, which is a typical structure of ionospheric anomalies occurring in response to positive surface electric charges. |
| Rights: | An edited version of this paper was published by AGU. Copyright 2016 American Geophysical Union |
| Type: | article |
| URI: | http://hdl.handle.net/2115/64395 |
| 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: He Liming
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