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Multi-instrument observation on co-seismic ionospheric effects after great Tohoku earthquake

  • [设施]:子午工程
  • [期刊/会议名称]:JOURNAL OF GEOPHYSICAL RESEARCH
  • [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.
  • [发表日期]:2012
  • [第一作者]:郝永强
  • [第一作者单位]:北京大学
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  • [论文类型]:期刊
  • [期刊分类]:GEOSCIENCES, MULTIDISCIPLINARY(SCI1区)
  • [学科分类]:
  • [影响因子]:3.426
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  • [期号]:117
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