Earthquake divide into natural earthquake and artificial earthquake two big classes. Natural earthquake tectonic earthquake mainly, it break, move, release out because of underground depths rock energy stood up to accumulate for a long time sharply by mistake, travel out to all directions in the form of seismic wave, go to the room caused on ground to shake the earthquake. The tectonic earthquake accounts for more than 90% of the total amount of earthquakes. Secondly from volcano erupt cause earthquake,call volcano earthquake,account for earthquake 7% of the total amounts. In addition some can produce earthquake too in special circumstances, grotto collapse for instance, large aerolite strike ground (aerolite strike earthquake),etc.. The artificial earthquake is the earthquake caused by artificial activity. Industry blow up for instance, underground vibration that nuclear explosion lead to the fact; Increase pressure of the earth's crust carry on high-pressure water flooding and large reservoir conservation storage among deep well, will bring out the earthquake too sometimes.