Disturbance identification of electric field data observed by the CSES-01 satellite before earthquakes

被引:0
|
作者
Jianping HUANG [1 ,2 ]
Fuzhi ZHANG [1 ,2 ]
Zhong LI [2 ]
Xuhui SHEN [1 ]
Baiyi YANG [2 ]
Wenjing LI [1 ]
Zhima ZEREN [1 ]
Hengxin LU [1 ]
Qiao TAN [1 ]
机构
[1] National Institute of Natural Hazards, Ministry of Emergency Management
[2] Institute of Intelligent Emergency Information Processing, Institute of Disaster Prevention
基金
中国国家自然科学基金;
关键词
D O I
暂无
中图分类号
P315.7 [地震观测预报];
学科分类号
070801 ;
摘要
Numerous studies have confirmed that electromagnetic disturbances before earthquakes can be observed by satellites.In this study, we use the C-value method that includes the acoustic whistle signature; pre-seismic ionospheric electromagnetic disturbance signals were acquired based on the CSES-01 satellite electric field data, and the maximum value of C in the earthquake preparation zones increased continuously from 2.0 three days before the earthquake and reached a maximum weight of 3.0 on the day of the earthquake, after the earthquake, it gradually decreased and recovered to about 2.0; its the C values fluctuated between-2 and 3, it is different from the C values range-2–12 of the previous seismic case study using the DEMETER satellite, which may be related to the orbital altitude and revisit period of the satellite. Then, the C values were normalized, and the time series analysis of the obtained θ values were done, and the results showed that: In the pregnant zone, the background variation of the disturbance amplitude θ is within 2σ, and the maximum disturbance amplitude of θ starts to increase gradually from the seventh period(one period of 5 days, i.e., 35–39 days before the earthquake), it reached 2σ by the fourth preseismic cycle(20–24 days before the earthquake), and then dropped sharply to about 1.5σ in the third pre-seismic cycle(15–19days before the earthquake), after two cycles of increase, the θ over the epicenter reached a maximum of 2.1σ at the time of the earthquake(combining the time of the earthquake and the satellite flight characteristics, the epicenter period is defined as January25-January 29, 2020, and this defines the study time period line), and the θ decreases to within 2 times the standard range after the earthquake; The negative value of the disturbance amplitude θ in the central region of the pregnant seismic zone during the earthquake shows the transient energy release process. Through comparison, the θ values obtained by normalization based on the C-value method takes into account the variation of the background field, and the result can better reflect the energy change of the ionospheric field before the earthquakes.
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收藏
页码:1814 / 1824
页数:11
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