Study on Characteristics of Seismic Ambient Shear Stress in Gansu Province

The breeding and occurrence of earthquake closely related to the intensity and spatial distribution of ambient shear stress field. Earthquakes would happen when the regional shear stress enhanced to the damage limit of rocks. In this paper, we used some acceleration records in Gansu province, and calculated corresponding seismic shear stress value according to the theory put forward by Professor Chen Peishan. Combined with the tectonic environment, we discussed the relationship of ambient shear stress with the magnitude and hypocentral depth.