Abstract:
According to the principle of historical earthquake recurrence and tectonic analogy, the potential source areas in Tangshan area are divided, and five potential source areas which have great influence on the study area are identified. After determining the seismicity parameters and ground motion attenuation relationship, the Tangshan area is meshed into 60 uniform independent site units, and the peak acceleration of ground motion that each site unit may suffer from and the corresponding exceeding probability in the future are calculated. Through interpolation analysis, the interval of peak acceleration isoline of bedrock in the original seismic zoning in the study area is further refined from 0.05 g to 0.01 g. The distribution map of peak acceleration of bedrock horizontal ground motion with a 50-year exceedance probability of 10% shows that the potential source area of Tangshan
M8.0 has the greatest impact on the study area.in the future.