Earth crust is lithosphere of the earth surface. Earthquake is the shaking of the surface of the Earth, resulting from the sudden release of energy in the Earth's lithosphere that creates seismic waves. Tectonic earthquakes caused by geological structure movement. Volcano tectonic earthquake is an earthquake induced by the movement of magma.Collapse earthquake caused by solid rock stratum (especially the limestone stratum). Earthquake is a normal and common natural phenomenon. Because of the complexity of the crustal structure and the non-intuitive of hypo central region, there are no exact explain for cause and mechanism of the earthquake, especially for tectonic earthquake. Now, it is generally acknowledged that tectonic earthquake is caused by the motion of crustal plates.

Because of the rotation, revolution and the internal material motion of earth, the lithosphere is continuously producing, developing and moving. This is the main reason for global tectonic movement. Through long-time observation, description and analysis by scientists, there are different hypothesis, concepts and theories about crustal structure and sea-land changes. Plate tectonic theory, also called global tectonics was just formed in 1960s, have accepted by lots of geologists as a tectonic movement theory.