Tsunami Social Commentary, Information on Tsunamis Introduction to Tsunami

It will cause a large number of human and livestock deaths, as well as damage to buildings and other facilities.

Tsunamis are powerful and can quickly hit villages and cities, as well as devour people and buildings. Tsunamis cause a large number of deaths of people and animals, and if the corpses are not cleaned up in time, they will also cause germs and plagues, causing serious harm to human beings and life and property.

Tsunamis are destructive waves with waves of up to 7-8 kilometers per hour due to seafloor eruptions, submarine landslides, or meteorological changes. Tsunamis are mainly controlled by the topography of the seabed, the geometry of the coastline and the characteristics of the waves, and the roaring waves and ice walls repeat themselves every few minutes or tens of minutes, destroying the embankments, flooding the land, and taking away life and property, which is extremely destructive.

Tsunamis are caused by the uplift and subsidence of the seafloor caused by **. The sudden deformation of the seabed caused a large surge of seawater from the seabed to the surface of the sea, resulting in a tsunami that hit the coastal areas. Since a tsunami moves the sea as a whole, it is much more destructive than a normal wave.

Under the influence of typhoons and low atmospheric pressure, the sea surface can cause huge waves, sometimes several meters high, but the wave width is limited, from a few meters to hundreds of meters, so the amount of sea water that hits the shore is also limited. Tsunamis are different, although the tsunami is only a few centimeters to several meters high in the distant sea, but due to the large range of the sea uplift, sometimes the width of the tsunami is hundreds of kilometers, and the destructive power of this huge "water block" is very huge, seriously endangering the buildings and human lives on the shore. According to Hideo Matsutomi, an associate professor at Akita University in Japan, the Indian Ocean tsunami pushed a 50-ton ship from the sea to a distance of 1 2 kilometers off the coast of Thailand.

Judging from the relevant data, the tsunami is as high as 2 meters, and the wooden houses will be destroyed in an instant; The tsunami was more than 20 meters high, and the reinforced concrete buildings were difficult to withstand.

One of the characteristics of a tsunami is that it is fast, and the deeper the water where it occurs, the faster the tsunami. Kenji Satake, head of the Active Fault Research Center at the National Institute of Advanced Industrial Science and Technology (AIST), said: "The deeper the water, the more water is surging due to changes in the seabed, and the faster it will move on the surface after a tsunami is formed."

If the water depth is 5,000 meters in the place where the earthquake occurred, the tsunami and the jet speed are about the same, up to 800 kilometers per hour, and when it moves to a depth of 10 meters, the speed slows down to 40 kilometers per hour. As the front waves slow down and the back waves push over and overlap, the tsunami to shore waves rise, and if the coastal seabed topography is V-shaped, the waves set off by the tsunami will be higher. ”

1. Tsunamis are destructive waves generated by submarine **, volcanic eruptions, submarine landslides or meteorological changes, with a wave speed of up to 700 800 kilometers per hour, which can cross the ocean in a few hours; The wavelength can reach hundreds of kilometers and can travel thousands of kilometers with little energy loss; In the vast ocean, the wave height is less than one meter, but when it reaches the shallow water of the coast, the wavelength decreases and the wave height increases sharply, reaching tens of meters, forming a "wall of water" containing huge energy.

2. Tsunamis are mainly controlled by the topography of the seabed, the geometry of the coastline and the characteristics of the waves, and the roaring waves and ice walls are repeated every few minutes or dozens of minutes, destroying the embankment, flooding the land, and taking away life and property, with great destructive power. The global tsunami zone is roughly the same as the ** zone. There are about 260 destructive tsunamis recorded worldwide, an average of about 260.

It happens once every six or seven years. The tsunami that occurred in the Pacific Rim accounted for about 80% of Wang Xun. The Japanese archipelago and its nearby waters account for about 60% of the tsunami in the Pacific Ocean, and Japan is the country that has suffered the most from the tsunami in the world.