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首页> 外文期刊>Earth, planets and space: EPS >Acoustic resonance and plasma depletion detected by GPS total electron content observation after the 2011 off the Pacific coast of Tohoku Earthquake
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Acoustic resonance and plasma depletion detected by GPS total electron content observation after the 2011 off the Pacific coast of Tohoku Earthquake

机译：在2011年东北太平洋地震后，通过GPS总电子含量观测发现的声共振和等离子体耗竭

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摘要

Two-dimensional structures of the ionospheric variations generated by the acoustic resonance between the ground surface and the lower thermosphere was observed for the first time near the epicenter after the M 9.0 Tohoku earthquake on March 11, 2011. A short-period oscillation of total electron content was observed by a GPS receiver array after the earthquake for four hours in the vicinity of the epicenter. It was centered in the east of the epicenter where the tsunami was estimated to commence. The frequency of the dominant mode of the oscillation was 4.5 mHz, 222 seconds of period, while there were minor oscillations whose frequency were 3.7 mHz and 5.3 mHz. These periods are consistent with the periods of the acoustic resonance between the ground surface and the lower thermosphere, predicted by a numerical model. The amplitude of the TEC oscillation showed a gradual change of the amplitude. The two-dimensional distributions of TEC variations generated by this resonance had wave frontal structures that extended from northwest to southeast. The resonant oscillation of the TEC was accompanied by a depletion of TEC whose duration was about 60 minutes. The area of this depletion also centered on the epicenter.
机译：在2011年3月11日东北9.0级地震发生后，在震中附近首次观察到了由地表与下层热层之间的声共振产生的电离层变化的二维结构。全电子的短周期振荡地震发生后四小时，在震中附近，用GPS接收器阵列观测到了海藻的含量。它位于震中估计发生海啸的东部。振荡的主模频率为4.5 mHz，周期为222秒，而次要振荡的频率为3.7 mHz和5.3 mHz。这些周期与通过数值模型预测的地表和下部热层之间的声共振周期一致。 TEC振荡的振幅显示出振幅的逐渐变化。由该共振产生的TEC变化的二维分布具有波前结构，其从西北延伸到东南。 TEC的共振振荡伴随着TEC的耗尽，持续时间约为60分钟。此耗竭区域也位于震中。

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