The northern part of China has a diffuse zone which is prone to seismic activities as compared to other parts of China or even other countries. The plate tectonics theory as is known by geologists helps in understanding seismic actions in China.
There are tectonic movements due to the influence of the Indo-Asian collision due to motions in the crust in the continental China. There is gravitational movement leading to spreading of the tectonic plates which has a major influence in the deformation of the crust in much of Asia. The northern China block experiences higher seismicity than the southern parts due to high stress forces in the northern plates. The south China lacks this stress forces and moves together as one block hence reduced or no seismic activity. Research has also shown that, as a result of previous seismic activity, an area is left prone to occurrences of similar stresses and seismic activity (Yang, 2007, p.3). This explains the frequency of occurrence of tectonic earthquakes in the northern parts unlike in other areas of the continental Asia.