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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 PublicationJOURNAL OF GEOPHYSICAL RESEARCH-SPACE PHYSICS
2012
Volume117Pages:A02305
ISSN0148-0227
Language英语
AbstractIn 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 BySCI
Funding Project中国科学院空间科学与应用研究中心
Document Type期刊论文
Identifierhttp://ir.nssc.ac.cn/handle/122/3267
Collection空间科学部
Corresponding AuthorHao, 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.
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