Multi-instrument observation on co-seismic ionospheric effects after great Tohoku earthquake
文献类型：期刊论文
| 作者 | Hao, Y. Q.; Xiao, Z.; Zhang, D. H. |
| 刊名 | JOURNAL OF GEOPHYSICAL RESEARCH-SPACE PHYSICS
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| 出版日期 | 2012 |
| 卷号 | 117页码:A02305 |
| ISSN号 | 0148-0227 |
| 通讯作者 | Hao, YQ (reprint author), Peking Univ, Dept Geophys, Beijing 100871, Peoples R China. |
| 中文摘要 | In this paper, evidence of quake-excited infrasonic waves is provided first by a multi-instrument observation of Japan's Tohoku earthquake. The observations of co-seismic infrasonic waves are as follows: 1, effects of surface oscillations are observed by local infrasonic detector, and it seems these effects are due to surface oscillation-excited infrasonic waves instead of direct influence of seismic vibration on the detector; 2, these local excited infrasonic waves propagate upwards and correspond to ionospheric disturbances observed by Doppler shift measurements and GPS/TEC; 3, interactions between electron density variation and currents in the ionosphere caused by infrasonic waves manifest as disturbances in the geomagnetic field observed via surface magnetogram; 4, within 4 hours after this strong earthquake, disturbances in the ionosphere related to arrivals of Rayleigh waves were observed by Doppler shift sounding three times over. Two of the arrivals were from epicenter along the minor arc of the great circle (with the second arrival due to a Rayleigh wave propagating completely around the planet) and the other one from the opposite direction. All of these seismo-ionospheric effects observed by HF Doppler shift appear after local arrivals of surface Rayleigh waves, with a time delay of 8-10 min. This is the time required for infrasonic wave to propagate upwards to the ionosphere. |
| 英文摘要 | In this paper, evidence of quake-excited infrasonic waves is provided first by a multi-instrument observation of Japan's Tohoku earthquake. The observations of co-seismic infrasonic waves are as follows: 1, effects of surface oscillations are observed by local infrasonic detector, and it seems these effects are due to surface oscillation-excited infrasonic waves instead of direct influence of seismic vibration on the detector; 2, these local excited infrasonic waves propagate upwards and correspond to ionospheric disturbances observed by Doppler shift measurements and GPS/TEC; 3, interactions between electron density variation and currents in the ionosphere caused by infrasonic waves manifest as disturbances in the geomagnetic field observed via surface magnetogram; 4, within 4 hours after this strong earthquake, disturbances in the ionosphere related to arrivals of Rayleigh waves were observed by Doppler shift sounding three times over. Two of the arrivals were from epicenter along the minor arc of the great circle (with the second arrival due to a Rayleigh wave propagating completely around the planet) and the other one from the opposite direction. All of these seismo-ionospheric effects observed by HF Doppler shift appear after local arrivals of surface Rayleigh waves, with a time delay of 8-10 min. This is the time required for infrasonic wave to propagate upwards to the ionosphere. |
| 学科主题 | 空间物理 |
| 资助信息 | NSFC [40904036]; China NIBRP [2011CB811405]; Specialized Research Fund for State Key Laboratories |
| 收录类别 | SCI |
| 语种 | 英语 |
| 公开日期 | 2014-12-15 |
| 源URL | [http://ir.nssc.ac.cn/handle/122/3267]  |
| 专题 | 国家空间科学中心_空间科学部 |
| 推荐引用方式 GB/T 7714 | Hao, Y. Q.,Xiao, Z.,Zhang, D. H.. Multi-instrument observation on co-seismic ionospheric effects after great Tohoku earthquake[J]. JOURNAL OF GEOPHYSICAL RESEARCH-SPACE PHYSICS,2012,117:A02305. |
| APA | Hao, Y. Q.,Xiao, Z.,&Zhang, D. H..(2012).Multi-instrument observation on co-seismic ionospheric effects after great Tohoku earthquake.JOURNAL OF GEOPHYSICAL RESEARCH-SPACE PHYSICS,117,A02305. |
| MLA | Hao, Y. Q.,et al."Multi-instrument observation on co-seismic ionospheric effects after great Tohoku earthquake".JOURNAL OF GEOPHYSICAL RESEARCH-SPACE PHYSICS 117(2012):A02305. |
入库方式： OAI收割
来源：国家空间科学中心
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