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<p>The generation mechanism for the geomagnetic field perturbation caused by a tsunami wave over land in a coastal region is studied. The sources of perturbation are electric currents in the marine environment and in the ionosphere. The current in conducting seawater arises as a result of its movement in the geomagnetic field during the propagation of a tsunami wave. The current in the ionosphere is caused by the movement of ionospheric plasma under the action of an acoustic-gravity wave radiated into the atmosphere due to the vertical displacement of the seawater surface in a tsunami wave. A model has been constructed describing geomagnetic disturbances caused by a tsunami wave and an acoustic-gravity wave, including the decay of a tsunami wave when the wave front reaches the coastline. The model makes it possible to explain the propagation of geomagnetic perturbations on land over long distances from the coastline. Based on this model, geomagnetic perturbations are calculated depending on time and distance to the coastline. The effects produced by currents in the marine environment and ionosphere are compared.</p>

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Perturbation of the geomagnetic field over the coastal land area caused by a tsunami wave

  • 期刊论文

  • 发表日期：

    2026年6月16日

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  • V. M. Sorokin,
  • V. V. Surkov,
  • A. K. Yashchenko

摘要

The generation mechanism for the geomagnetic field perturbation caused by a tsunami wave over land in a coastal region is studied. The sources of perturbation are electric currents in the marine environment and in the ionosphere. The current in conducting seawater arises as a result of its movement in the geomagnetic field during the propagation of a tsunami wave. The current in the ionosphere is caused by the movement of ionospheric plasma under the action of an acoustic-gravity wave radiated into the atmosphere due to the vertical displacement of the seawater surface in a tsunami wave. A model has been constructed describing geomagnetic disturbances caused by a tsunami wave and an acoustic-gravity wave, including the decay of a tsunami wave when the wave front reaches the coastline. The model makes it possible to explain the propagation of geomagnetic perturbations on land over long distances from the coastline. Based on this model, geomagnetic perturbations are calculated depending on time and distance to the coastline. The effects produced by currents in the marine environment and ionosphere are compared.