Tsunami

tsunami vector in brushed Kanji
Waves that propagate widely in the ocean, mainly caused by sudden changes in the seafloor topography caused by earthquakes. In rare cases, it is also caused by large-scale shocking forces such as eruptions of submarine volcanoes, landslides near the coast, and nuclear tests on the ocean.
Note that unlike high waves and storm surges, the energy of the waves is orders of magnitude stronger.
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つなみ 漢字