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It is a long and high wave or waves. The reason for their appearance is an underwater earthquake or a volcanic eruption. More than 80% of tsunamis occur in the Pacific Ocean
An undersea earthquake in the Indian Ocean, 26 December 2004, caused a tsunami, which was considered the deadliest natural disaster in modern history. 18 countries suffered from it. 300 thousand people died
The tsunami wave speed is over 800 km/h The wave can reach lengths of tens to hundreds kilometres Before the tsunami hits, you can watch a quick and strong tide.