North-Southern Dynasties: Crustal stress fields

Since the Wei, Jin, and North-Southern Dynasties, Buddhism has flourished and a large number of caves have been excavated in the northern China. Stability problems in rock stress fields highlighted. It is a direct source of force for crustal deformation, rock destruction, and earthquake occurrence. The update of the global GPS velocity field and World Stress Map was completed not long ago through large-scale international cooperation. Plates with the soul of a power source are no longer a bunch of rigid tectonics, and for the first time the dynamism of their movements and internal stresses are revealed. This paper describes the methods of in-situ measurement of stress, the principles of division of stress tensor regimes, and the basic features of stress maps. In response to the important position of earthquake focal mechanism in the constitutive stress map, the authors have drawn a variety of 3D perspective drawings, so that readers can easily grasp the geologic meaning of the earthquake focal mechanism in a way that is easy to read and understand by looking at the drawings. Finally, the background of the local dynamics is analyzed with two examples comparing the similarities and differences between the measured stress maps and the earthquake focal mechanism.