Singular Spectrum Analysis of the Total Electron Content Changes Prior to M ≥ 6.0 Earthquakes in the Chinese Mainland During 1998–2013

Chen，Hongyan1; Miao，Miao1; Chang，Ying2; Wang，Qiao3; Shen，Xuhui3; Hattori，Katsumi4,5; Han，Peng1

2021-05-28

10.3389/feart.2021.677163

Frontiers in Earth Science   影响因子和分区

2296-6463

Early studies have shown evidence of the seismo-ionospheric perturbations prior to large earthquakes. Due to dynamic complexity in the ionosphere, the identification of precursory ionospheric changes is quite challenging. In this study, we analyze the total electron content (TEC) in the global ionosphere map and investigate the TEC changes prior to M ≥ 6.0 earthquakes in the Chinese Mainland during 1998–2013 to identify possible seismo-ionospheric precursors. Singular spectrum analysis is applied to extract the trend and periodic variations including diurnal and semi-diurnal components, which are dominated by solar activities. The residual ΔTEC which is mainly composed of errors and possible perturbations induced by earthquakes and geomagnetic activities is further investigated, and the root-mean-square error is employed to detect anomalous changes. The F and Dst index is also used as criterion to rule out the anomalies when intense solar or geomagnetic activities occur. Our results are consistent with those of previous studies. It is confirmed that the negative anomalies are dominant 1–5 days before the earthquakes at the fixed point (35°N, 90°E) during 0600–1000 LT. The anomalies are more obvious near the epicenter area. The singular spectrum analysis method help to establish a more reliable variation background of TEC and thus may improve the identification of precursory ionospheric changes.

earthquake ionospheric anomaly singular spectrum analysis statistical analysis total electronic content

SCI

英语

第一 ; 通讯

WOS:000659888000001

2-s2.0-85107542282

Scopus

1.Department of Earth and Space Sciences,Southern University of Science and Technology,Shenzhen,China
2.Institute of Mining Engineering,BGRIMM Technology Group,Beijing,China
3.National Institute of Natural Hazards,Ministry of Emergency Management of China,Beijing,China
4.Graduate School of Science,Chiba University,Chiba,Japan
5.Center for Environmental Remote Sensing,Chiba University,Chiba,Japan

Chen，Hongyan,Miao，Miao,Chang，Ying,等. Singular Spectrum Analysis of the Total Electron Content Changes Prior to M ≥ 6.0 Earthquakes in the Chinese Mainland During 1998–2013[J]. Frontiers in Earth Science,2021,9.

Chen，Hongyan.,Miao，Miao.,Chang，Ying.,Wang，Qiao.,Shen，Xuhui.,...&Han，Peng.(2021).Singular Spectrum Analysis of the Total Electron Content Changes Prior to M ≥ 6.0 Earthquakes in the Chinese Mainland During 1998–2013.Frontiers in Earth Science,9.

Chen，Hongyan,et al."Singular Spectrum Analysis of the Total Electron Content Changes Prior to M ≥ 6.0 Earthquakes in the Chinese Mainland During 1998–2013".Frontiers in Earth Science 9(2021).