Because the earth is constantly moving and changing, it gradually accumulates huge energy, causing sudden rupture of rock strata or dislocation of original faults in some fragile areas of the crust. This is an earthquake. Most earthquakes occur in the earth's crust. Earthquakes are divided into tectonic earthquakes, volcanic earthquakes, subsidence earthquakes and induced earthquakes. Tectonic earthquake means that under the action of tectonic movement, when the local stress reaches and exceeds the strength limit of rock stratum, the rock stratum will suddenly deform or even rupture, and the energy will be released at once, causing ground motion. This kind of earthquake is called tectonic earthquake, accounting for more than 90% of the total number of earthquakes.

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