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Earthquake and its definition

Earthquakes, also known as ground vibrations, are the vibrations that occur during the rapid release of energy from the earth's crust and are a natural phenomenon of seismic waves. The collision in plates on the earth results in faulting and rupture within the plates and edges , that is the main cause of earthquakes.

The place where the earthquake started was called the hypocenter, and the ground just above the epicenter is called the epicenter. The most severe ground vibration of a destructive earthquake is called a "polar earthquake zone", which is often the epicenter of the earthquake. Earthquakes often cause heavy secondary casualties, such as fires, floods, poisonous gas leaks, bacteria, radioactive materials,tsunamis, landslides, and ground fissures.

According to statistics, there are about 5000000 earthquakes per year, that is, thousands of earthquakes occur every day. Most of them are too small or too far, so the people could affect about ten times. Earthquake can cause serious harm to human. An earthquake that cannot be felt must be recorded with seismographs. Different types of seismographs can record different intensities and distances. The world operates thousands of seismograph instruments that monitor the movements of earthquakes day and night.

The present level of science and technology has not yet been able to predict the arrival of earthquakes.The examples of successful prediction of earthquakes are basically coincidental. For earthquakes, we should do more to improve the seismic rating of buildings and to do better defense than predict earthquakes.