Version 1
: Received: 11 April 2017 / Approved: 11 April 2017 / Online: 11 April 2017 (06:54:25 CEST)
How to cite:
Jiang, W.; Ma, Y.; Zhou, X.; Li, Z.; An, X.; Wang, K. Analysis of Ionospheric Vertical Total Electron Content before the 2014 Mw8.2 Chile Earthquake. Preprints2017, 2017040060. https://doi.org/10.20944/preprints201704.0060.v1
Jiang, W.; Ma, Y.; Zhou, X.; Li, Z.; An, X.; Wang, K. Analysis of Ionospheric Vertical Total Electron Content before the 2014 Mw8.2 Chile Earthquake. Preprints 2017, 2017040060. https://doi.org/10.20944/preprints201704.0060.v1
Jiang, W.; Ma, Y.; Zhou, X.; Li, Z.; An, X.; Wang, K. Analysis of Ionospheric Vertical Total Electron Content before the 2014 Mw8.2 Chile Earthquake. Preprints2017, 2017040060. https://doi.org/10.20944/preprints201704.0060.v1
APA Style
Jiang, W., Ma, Y., Zhou, X., Li, Z., An, X., & Wang, K. (2017). Analysis of Ionospheric Vertical Total Electron Content before the 2014 Mw8.2 Chile Earthquake. Preprints. https://doi.org/10.20944/preprints201704.0060.v1
Chicago/Turabian Style
Jiang, W., Xiangdong An and Kaihua Wang. 2017 "Analysis of Ionospheric Vertical Total Electron Content before the 2014 Mw8.2 Chile Earthquake" Preprints. https://doi.org/10.20944/preprints201704.0060.v1
Abstract
This paper studies ionospheric vertical total electron content (VTEC) variations before the 2014 Mw8.2 Chile earthquake. VTEC derived from 14 GPS (Global Positioning System) stations and GIM (Global Ionospheric Map) were used to analyze ionospheric variations before the earthquake using the sliding interquartile range method, and results showed that significant positive VTEC anomalies occurred on 28 March. To explore possible causes of these anomalies, effects of solar and geomagnetic activities were examined, and VTEC variations during 17 March to 31 March in 2009-2013 were cross-compared. Also, VTEC for a full year before the earthquake was investigated. Results indicated that these anomalies were weakly associated with high solar activities and geomagnetic storms and that these anomalies were not normal seasonal and diurnal variations. An analysis of the spatial distribution of the observed anomalies was also presented, and it demonstrated that anomalies specifically appeared around the epicenter on 28 March. It suggests that observed anomalies may be associated with the subsequent Chile earthquake. Equatorial anomaly variations were analyzed to discuss the possible physical mechanism, and results showed that the equatorial anomaly unusually increased on 28 March, which indicates that anomalous electric fields generated in the earthquake preparation area and the meridional wind are possible causes of the observed ionospheric anomalies.
Keywords
Ionosphere; vertical total electron content (VTEC); seismo-ionospheric anomaly
Subject
Environmental and Earth Sciences, Space and Planetary Science
Copyright:
This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.
