Why did the earthquake?

■ Why is there an earthquake? 

  Although the ground under our feet feel very stable, in fact, the entire Earth's surface is constantly changing. Such a change is because the Earth's case that there are many of the plates, plates, if touched, it will have a push. Plates pushing cause uplift or fall of the land, in the course of these pushed, there will be an earthquake occurred. 

 ■ What is the plate? 

  Earth can be simply divided into crust, mantle and core. In addition to the composition of Earth's physical properties of substances can be divided into the Earth's lithosphere and asthenosphere. Earth's lithosphere is the most external cold and hard material: the lithosphere under the asthenosphere is higher by the heat plastic composed of precursor substances. "Plate" refers to the lithosphere, which includes part of the crust and mantle. 

  Earth's crust there are many cracks. These cracks in the deep sea bed, from the cracks in continuous outflow of hot magma. Magma cooled, it solidified into a new crust. 

  Keep the earth's crust because the new generation, will be the original crust is pushed outward, so the crust on land and sea will be followed by a block below the earth's crust to move. Mobile when the earth's crust below the earth's crust and upper mantle will move along with, so we put together under the earth's crust is linked to move part of a letter known as a plate. 

  Earth's surface is divided into 7 main sections, including the Pacific Plate, the Eurasian Plate, the North American Plate, the South American Plate, the African Plate, Indo-Australian Plate and the Antarctic plate. 

  The world's three major seismic zone, namely around the Pacific Rim's "circum-Pacific seismic belt"; Eurasia the southern edge of the "Eurasian seismic belt"; as well as the ocean's "mid-ocean ridge seismic belt." Earth is 95% of the seismic activity caused by the plates, while the remaining 5 percent is a result of volcanic activity, the underground nuclear explosion, collapse of the earth's crust, or from meteorite impacts.