简单地说,主要的原因是:各板块之间相互挤压的地震。另一座火山喷发造成的。四川大地震分为天然地震和人工地震两大类。天然地震构造地震,它是主要的地下深处岩石破裂,脱位长期积累的能量迅速释放,地震波的形式传播来自四面八方,威力是很大的。
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Simply put, the main reasons are: the earth quake of each plate between the mutual extrusions. Another volcano eruption caused by.The earthquake is divided into natural earthquake and artificial earthquake two categories. Natural earthquake tectonic earthquake mainly, it is the result of deep underground rock fracture, dislocation of the long-term accumulated energy is released quickly, in the form of seismic wave to spread out from all sides, to the ground caused by the real earth quakes. Tectonic earthquake accounted for more than 90% of the total earthquake. This is followed by a volcano eruption caused by earthquake, known as the volcano earthquake, accounting for about7% of the total number of earthquakes. In addition, some special cases can generate earthquakes, such as caves collapse (the fall of the earthquake), a large meteorite impact ground (meteorite impact earthquake).
人工地震是由人类活动在地震中。如工业爆破,地下核爆炸造成的振动;在深的水在高压水和大量增加了地壳的压力,有时还会诱发地震。
The artificial earthquake is caused by human activities in the earthquake. Such as industrial blasting, the vibration caused by underground nuclear explosions; in deep water in high pressure water and the large increase of crustal stress, sometimes induced earthquake.
The place is called seismic waves, seismic source. Focus on the ground of the vertical projection, called the epicenter. The epicenter to the focal depth is called the focal depth. Usually the focal depth of less than 70 km depth is shallow source earthquake, at 70-300 km is a seismic source, at depths greater than 300kilometers is called deep earthquakes. Destructive earthquakes are generally shallow earthquake. Such as the 1976 Tangshan earthquake focal depth of 12km.
The mantle convection. Is from the earth's internal decay of radioactive elements produced by the power that drives. Earth energy release external performance. Internal energy releases are mainly about a form: earthquake, volcano, plate tectonics, and geological structure. Earthquake is one of them.
(1) In the earth's interior are source, source outward to release energy ( seismic ) can cause a range of vibration.
(2) Other geological disaster or natural disaster, can also indirectly induced earthquake.
The mantle convection. Is from the earth's internal decay of radioactive elements produced by the power that drives. Earth energy release external performance. Internal energy releases are mainly about a form: earthquake, volcano, plate tectonics, and geological structure. Earthquake is one of them.
On the afternoon of May 12, 20082, Sichuan Province, a 7.8 magnitude earthquake struck. The earthquake caused heavy casualties, there are nearly a million deaths, tens of thousands of people at all, countless houses collapsed. In the face of the sudden earthquake, so many and we are students going to school because the school collapsed while being
Because of this the merciless earthquake, claimed the precious life, they would like us to love learning, across the ocean of life, as of a beautiful dream full of fantasy, the world is full of curiosity, they had some clever child, and is now buried in the rubble, was destroyed in an earthquake all. It was time to go to school, so many of the dead are students. The relief workers came to the collapsed ruins site, here, the sky
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