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首页> 外文期刊>Journal of Geophysical Research, A. Space Physics: JGR >Multi-instrument observation on co-seismic ionospheric effects after great Tohoku earthquake
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Multi-instrument observation on co-seismic ionospheric effects after great Tohoku earthquake

机译：Multi-instrument观察co-seismic日本东北大地震后电离层的影响

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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.
机译：在本文中,quake-excited的证据次声的波提供了第一个multi-instrument观察日本的东北部地震。次声的波如下:1,的影响表面振荡观察到的地方次声的探测器,似乎这些影响是由于表面oscillation-excited次声的波,而不是地震的直接影响振动探测器;向上次声的波传播和对应通过多普勒电离层扰动观察改变测量和GPS /侦探;电子密度变化和电流之间的关系次声的波浪引起的电离层表现为在地磁场干扰通过观察表面磁力图;这强烈地震后几小时,干扰在瑞利的电离层与移民有关波是由多普勒频移观测三倍之多。沿着大圆的劣弧震中(第二次到来由于瑞利波传播完全)和周围的行星另一个相反的方向。这些seismo-ionospheric效应观察高频多普勒频移出现在当地的移民表面瑞利波,8 - 10的时间延迟分钟。这是次声的所需的时间电离层波向上传播。

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