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Tsunami refers to ocean waves that are triggered by submarine **, volcanic eruptions, and underwater landslides and subsidence, and their wavelengths can reach hundreds of kilometers. It is manifested in the form of a steep rise of the sea in the coastal area, suddenly forming a "water wall", accompanied by a rumbling sound, instantly invading the coastal land, engulfing fertile land and towns and villages, and then the sea water suddenly recedes, or first retreats and then rises, sometimes repeatedly, causing huge losses of life and property. Local tsunami before the tsunami wave arrives:
It is also often accompanied by strong ** or earthquakes. China is also a country with many storm surge disasters, and the tide level anomalies manifested by storm surge and tsunami have been confused with tsunamis, overflow or ocean tide. In the past 20 years, China's academic circles have decided to refer to the tide level anomalies caused by storms and ** as storm surges and tsunamis respectively.
In addition, disasters caused by flooding of coastal areas caused by anomalous tide levels caused by astronomical, storm, and ** causes are sometimes referred to as "tidal disasters." In most cases, however, the term tidal wave is customarily referred to as storm surge disaster. The initial rise of the water surface near the epicenter of the tsunami in the ocean is only 1 to 2 meters, and when this ocean wave moves in the deep ocean, the wavelength can reach tens to hundreds of kilometers, the period can reach 200 minutes, and the most common is to embarrassment, and the propagation speed can reach nearly 1,000 kilometers and hours.
Therefore, the tsunami does not cause damage in the deep ocean and is even difficult to detect such fluctuations. However, when the tsunami wave enters the continental shelf, the amplitude increases due to the sharp shallowness of the depth and the concentration of energy. If the continental shelf is very narrow, a tsunami wave with a flow velocity of almost the same from the sea surface to the bottom of the sea carries huge energy to the shore or harbor, and the wave height increases suddenly, and the wave amplitude may be 20-30 meters, causing the wave to roll up.
This huge wave rushes there, and there is a ruin, and it is in these places that the tsunami becomes the greatest threat to life and a terrible natural phenomenon.
In May 1960, a strong ** struck the seabed in south-central Chile, triggering a huge tsunami that killed and left tens of thousands of people dead, paralyzed all the docks along the coast, and left 2 million people homeless, making it the world's largest and most serious tsunami disaster.
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A tsunami is a fluctuation of water caused by the ocean**!
Cracks in the ocean's crust give kinetic energy to seawater, and the reverse wave that hits when the crack is full is a tsunami is a tsunami. The crack scale is a big tsunami! The crack scale is small, and the tsunami is small!
Therefore, there is a theory that the tide recedes for no reason before the tsunami.
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It is mainly related to the difference in heat between land and sea.
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Storms and tsunamis in Southeast Asia are frequent.
Because Southeast Asia is located at the junction of three major plates (Eurasian plate, Pacific plate, and Indian Ocean), it is also the junction of the world's two major volcanic ** belts. Plate activity is frequent. Prone to multiple episodes**.
And the magnitude of the earthquake is larger**, which can induce a tsunami. Therefore, Southeast Asia is the most tsunami-prone area.
Tsunamis in Southeast Asia are huge waves caused by oceans**, and according to the data, most of the ocean** occurs in those areas of the oceanic crust on the edge of the Pacific Ocean where the oceanic crust is covered by a heavier continental crust. When this pressure accumulates to a certain saturation point, it is released through **, and the edge of the plot is broken, so part of the seabed rises or sinks suddenly, thus forming a violent "jittery shake" in the entire water layer from the seabed to the sea surface, causing a tsunami.
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Tsunami is one of the most important secondary disasters on the seabed, and Sun Shihong said that tsunami will not occur if it occurs inland. In the case of Japan, because the epicenter was located 130 kilometers away on the seabed, not land, the damage and damage caused by the tsunami were much greater than the ** itself. >>>More
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