| Autor: |
Li, Mei1 mei_seis@163.com, Shen, Xuhui2, Parrot, Michel3, Zhang, Xuemin4, Zhang, Yan1, Yu, Chen1, Yan, Rui2, Liu, Dapeng2, Lu, Hengxin2, Guo, Feng2, Huang, Jianping2 |
| Předmět: |
|
| Zdroj: |
Journal of Geophysical Research. Space Physics. Dec2020, Vol. 125 Issue 12, p1-13. 13p. |
| Abstrakt: |
Oppositely to a previous statistical work using a single time resolution of the total ion density measured onboard the Detection of Electro‐Magnetic Emissions Transmitted from Earthquake Regions (DEMETER) satellite, this work deals with statistical seismo‐ionospheric influences by comparing different parameters and various time resolutions. The O+ density and electron density recorded by the China Seismo‐Electromagnetic Satellite (CSES) for more than one year and by the DEMETER satellite for about 6.5 years have been utilized to globally search ionospheric perturbations with different time resolutions. A comparison is automatically done by software between the occurrence of these ionospheric perturbations determined by different data sets, and the occurrence of earthquakes under the conditions that these perturbations occur at less than 1,500 km and up to 15 days before the earthquakes. Combined with statistical results given by both satellites, it is shown that the detection rate r of earthquakes increases as the data time resolution and the earthquake magnitude increase and as the focal depth decreases. On average, the number of perturbations is higher the day of the earthquake, and then smoothly decreases the days before, which is independent of either ionospheric parameters or time resolutions. The number of right alarms is high near the South Atlantic Magnetic Anomaly area but its relationship with seismic activities is weak. The ion density tends to be more sensitive to seismic activities than the electron density but this needs further investigations. This study shows that the CSES could effectively register ionospheric perturbations due to strong EQs as the DEMETER satellite does. Key Points: This work presents primary statistical seismo‐ionospheric influences by comparing different parameters and various time resolutionsDifferent parameters and various time resolutions affect detection rate but independent of seismo‐ionospheric influence evolutionThis study shows that the CSES could effectively register ionospheric perturbations due to strong EQs [ABSTRACT FROM AUTHOR] |
| Databáze: |
GreenFILE |
| Externí odkaz: |
|
Plný text