Tsunamis do not belong to the possible bad weather at sea, do they? Knowledge and questions and answers.

Tsunami is a destructive wave caused by submarine earthquake, volcanic eruption, submarine landslide or meteorological change. The wave speed of tsunami is as high as 700 ~ 800 kilometers per hour, and it can cross the ocean in a few hours. Wavelength can reach hundreds of kilometers, can spread thousands of kilometers, and energy loss is small; In the vast ocean, the wave height is less than one meter, but in the shallow sea coast, the wavelength becomes shorter and the wave height increases sharply, reaching tens of meters, forming a "water wall" with great energy. Tsunami is mainly controlled by seabed topography, coastline geometry and wave characteristics. Roaring waves and ice walls repeat every few minutes or dozens of minutes, destroying banks, flooding land, taking away lives and property, which is extremely destructive. The global tsunami occurrence area is roughly consistent with the earthquake zone. There are about 260 recorded destructive tsunamis in the world, averaging about once every six or seven years. Earthquakes and tsunamis around the Pacific Ocean account for about 80%.