[M-IS08] Interdisciplinary studies on pre-earthquake processes

[MIS08-02] The multi observations on electromagnetic emissions and plasma perturbations around Yutian Earthquakes in China

★Invited Papers

*Xuemin Zhang¹、Jing Liu¹、Angelo De Santis²、Loredana Perrone²、Xuhui Shen³、Jianping Huang³ (1.Institute of Earthquake Forecasting, China Earthquake Administration、2.Istituto Nazionale di Geofisica e Vulcanologia、3.Institute of Crustal Dynamics, China Earthquake Administration)

キーワード：GPS TEC, CSES satellite, Ionospheric perturbation, LAIC model

Based on the multi data of TEC inversed from GPS observations in China mainland, TEC mapping published by JPL, electron density from Zhangheng-1 satellite, electromagnetic data from ground geomagnetic observatories and ZH-1 satellite, the ionospheric perturbations were mainly analyzed around Yutian Ms6.4 earthquake on 26 June 2020, in Xinjiang Uygur Autonomous Region. The plasma perturbations were revealed from peak F2 layer to the topside ionosphere at satellite height about 507km. The electromagnetic emissions were enhanced before the earthquake, but its seasonal variations make it difficult to distinguish those anomalies possibly related to the earthquake. The consistence from ground and space-borne experiments may help to validate the earthquake-associated disturbances. Combined with the results for other three earthquakes in Yutian with magnitude larger than 6.0 during 2008-2020, it is found that the seismo-ionospheric disturbances concentrated 1 week before, mainly with increasing features and local effects, in which some showed simultaneous anomaly at its conjugate region. The comprehensive multi data analysis can improve the distinguishing capability for earthquake-related anomalies, and enhance their reliability. The solar activity and space magnetic disturbances will cause high frequent anomaly occurrence in the global maps, and influence heavily for abstracting the seismo-ionospheric signals. But a case study for solar eclipse on 21 June 2020 induced decreasing TEC anomalies, which is totally different with those related to Yutian earthquake, whatever in region or abnormal state. The LAIC couping process was discussed finally, and the effects from overlapped electric field were simulated by SAMI-2 model in high and low solar activity year.