海啸被认为是常常与地震相关的巨大的海洋波动。当这类波动到达海岸时,其波高可达几十米,往往对沿海地区造成灾难性后果。然而,当这类波动在开阔大洋传播时,其波高则只有几米。因此,我们难以从正常的大洋波动场中辨识海啸波。对在大洋中传播的海啸而言,其波高可能不大,但是它具有极长的波长和极高的传播速度,所以使得巨大的水体产生水平位移。当含盐的海水在地磁场中运动时,其传导特性将诱导地磁场的微小变化,该变化量将有可能被装于近地轨道卫星或高空气球的磁传感器探测到。上海交通大学王本龙副教授和刘桦教授提出了 Tsunamis are considered as large ocean waves often associated with earthquakes. When such waves reach the coast, the wave height can reach tens of meters, often with disastrous consequences for the coastal areas. However, when this kind of fluctuation spreads in the oceans, its wave height is only a few meters. Therefore, it is difficult for us to recognize the tsunami wave from the normal oceanic fluctuation field. For tsunamis that travel in the oceans, the wave height may not be large, but it has extremely long wavelengths and extremely high propagation velocity, thus causing horizontal displacements of huge bodies of water. When salty seawater moves in a geomagnetic field, its conduction properties induce small changes in the geomagnetic field, which are likely to be detected by magnetic sensors mounted in near-Earth orbiting satellites or high-altitude balloons. Shanghai Jiao Tong University Associate Professor Wang Benlong and Professor Liu Hua made