| Multi-instrument observation on co-seismic ionospheric effects after great Tohoku earthquake | |
| Hao, Y. Q.; Xiao, Z.; Zhang, D. H.; Hao, YQ (reprint author), Peking Univ, Dept Geophys, Beijing 100871, Peoples R China. | |
| Department | 空间科学部 |
| Source Publication | JOURNAL OF GEOPHYSICAL RESEARCH-SPACE PHYSICS
 |
| 2012 | |
| Volume | 117Pages:A02305 |
| ISSN | 0148-0227 |
| Language | 英语 |
| Abstract | 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.; 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. |
| Indexed By | SCI |
| Funding Project | 中国科学院空间科学与应用研究中心 |
| Document Type | 期刊论文 |
| Identifier | http://ir.nssc.ac.cn/handle/122/3267 |
| Collection | 空间科学部 |
| Corresponding Author | Hao, YQ (reprint author), Peking Univ, Dept Geophys, Beijing 100871, Peoples R China. |
| Recommended Citation GB/T 7714 | Hao, Y. Q.,Xiao, Z.,Zhang, D. H.,et al. 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.,&Hao, YQ .(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. |
| Files in This Item: | Download All | |||||
| File Name/Size | DocType | Version | Access | License | ||
| 2012117A02305.pdf（575KB） | 开放获取 | CC BY-NC-SA | View Download | |||
Items in the repository are protected by copyright, with all rights reserved, unless otherwise indicated.
Edit Comment