2017年九寨沟M7.0地震前临震电离层异常研究

doi:10.12196/j.issn.1000-3274.2022.04.008

Abstract

Abstract: In order to investigate the ionospheric anomalies before the Jiuzhaigou M7.0 earthquake which occurred on August 8, 2017 in Sichuan, we used ground-based GNSS VTEC and ionosonde foF2 observation data to investigate the ionospheric variations in 20 days before the earthquake. We found that two significant positive ionospheric anomalies appeared near the epicenter 4 days and 5 hours before the earthquake. Considering the solar-terrestrial space environment around the days of the anomalies, we conclude that the former anomaly should be caused by a magnetic storm, whereas the latter occurring on the day of the earthquake may be caused by the seismogenic activity. This paper indicates that the ionosonde measurements are consistent with GNSS VTEC observations on ionospheric anomaly detection. Compared with the lag in the release time of GNSS data and products, ionosonde acquires data more timely. Combining the two ionospheric observation methods will promote superiority complement for each other, and then improve capabilities of seismo-ionospheric monitoring.

Key words: Earthquake, Ionospheric anomaly, GNSS, VTEC, Ionosonde

CLC Number:

P315.7

YANG Jian, ZHANG Yu, HU Liang-chen, WANG Lan-wei, ZHU Fu-ying. Impending Ionospheric Anomalies before the 2017 Jiuzhaigou M7.0 Earthquake[J]. EARTHQUAKE, 2022, 42(4): 100-110.

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Impending Ionospheric Anomalies before the 2017 Jiuzhaigou M7.0 Earthquake

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