DOI: 10.1002/2013JD020269
论文题名: Anomalous phenomena in Schumann resonance band observed in China before the 2011 magnitude 9.0 Tohoku-Oki earthquake in Japan
作者: Zhou H. ; Zhou Z. ; Qiao X. ; Yu H.
刊名: Journal of Geophysical Research Atmospheres
ISSN: 21698996
出版年: 2013
卷: 118, 期: 23 起始页码: 13338
结束页码: 13345
语种: 英语
英文关键词: Earth-ionosphere cavity
; FDTD method
; ionospheric anomaly
; Schumann resonance
; Tohoku-Oki earthquake
Scopus关键词: Finite difference time domain method
; Ionosphere
; Magnetic fields
; Numerical methods
; Radio waves
; Resonance
; Atmospheric conductivity
; Disturbance modeling
; Earth-ionosphere cavity
; Ionospheric anomalies
; Magnetic field components
; Schumann resonances
; Tohoku-Oki earthquakes
; Total electron content
; Earthquakes
; anomaly
; earthquake epicenter
; electron
; ionosphere
; magnetic field
; numerical model
; resonance
; seismicity
; Tohoku earthquake 2011
; Taiwan
英文摘要: The anomalous phenomena in the Schumann resonance (SR) band, possibly associated with the Tohoku-Oki earthquake (EQ), are studied based on the ELF observations at two stations in China. The anomaly appeared on 8 March, 3 days prior to the main shock, and was characterized by an increase in the intensity at frequencies from the first mode to the fourth mode in both magnetic field components, different from the observations in Japan before large EQs in Taiwan. The abnormal behaviors of the north-south and east-west magnetic field components primarily appeared at 0000-0900 UT and 0200-0900 UT on 8 March, respectively. The finite difference time domain numerical method is applied to model the impact of seismic process on the ELF radio propagation. A partially uniform knee model of the vertical conductivity profile suggested by V. C. Mushtak is used to model the day-night asymmetric Earth-ionosphere cavity, and a locally EQ-induced disturbance model of the atmospheric conductivity is introduced. The atmospheric conductivity is assumed to increase around the epicenter according to the localized enhancement of total electron content in the ionosphere. It is concluded that the SR anomalous phenomena before the Tohoku-Oki EQ have much to do with the excited sources located at South America and Asia and also with the localized distribution of the disturbed conductivity. This work is a further confirmation of the relationship of SR anomalies with large EQs and has further concluded that the distortions in the SR band before large EQs may be caused by the irregularities located over the shock epicenter in the Earth-ionosphere cavity by numerical method. Key Points SR anomalies before the Tohoku-Oki earthquake are studied SR anomalies are simulated by FDTD method Irregular conductivity by earthquake modifies the propagation of SR ©2013. American Geophysical Union. All Rights Reserved. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/63104
Appears in Collections: 影响、适应和脆弱性 气候减缓与适应
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作者单位: School of Information Engineering, Harbin Institute of Technology, Weihai 264209, China
Recommended Citation:
Zhou H.,Zhou Z.,Qiao X.,et al. Anomalous phenomena in Schumann resonance band observed in China before the 2011 magnitude 9.0 Tohoku-Oki earthquake in Japan[J]. Journal of Geophysical Research Atmospheres,2013-01-01,118(23)