Seismic Risk Analysis Of Baoji City

Considering the uncertainty of the earthquake to evaluate the regional future seismic impact is important for earthquake-proof and seismic disaster mitigation. The landscape type of Baoji features greatly in the potential threat of future earthquakes. The seismic hazard assessment is an important work among the geological hazard assessments of Baoji city. In line with seismic stability evaluation of the Baoji loess slope and based on the Chinese national seismic intensity zonation, the paper studies the contribution of regional geological structure to seismic attenuation.The paper discusses the area with the seismic impact radius of 150km around the center in Baoji North slope. In the full collection of regional geological structure and historical seismic data, analyze statistically the earthquake recurrence relationships (magnitude-frequency relation) and attenuation law of ground motion in the potential hypocenter of Baoji city. Based on the principle of seismic wave reverse propagation and the relationships of seismic intensity attenuation in different directions, form a synthetic relationship with Baoji as the epicenter. Besides, intensity attenuation relations are converted into the bedrock peak acceleration attenuation ones.Mesh the area of Baoji city into several units of a certain scale according to the seismic hazard assessment requirements. By the application of the probabilistic seismic hazard analysis method, obtain the earthquake peak acceleration and transcendence probability and further get the diverse distribution of seismic effected intensity of Baoji city corresponding to different exceeding probability in the future.The study concluded on the seismic peak acceleration distribution of bedrock of Baoji under diverse transcendence probability in the future 50 years and the contour zoning map of bedrock seismic peak acceleration with 10% exceeding probability in the future 50 years. These results could contribute to the seismic impact assessment and evaluation of geological disasters induced by earthquakes.