The Simulation of Tangshan Earthquake Intensity Field Based on Stochastic Finite Fault Model

Abstract

The random ground motion simulation method based on the finite fault model is one of the proven methods in the field of simulating high frequency ground motion. Taking the extreme earthquake zone of the Tangshan earthquake in 1976 as the research goal, by combing the research results of the predecessors, the calculation model of the target zone was established and the parameters of the source model were determined. The local site data and the site dynamics parameters of the target zone were utilized. The quarter-wavelength method is used to obtain the local field amplification effect parameters. The strong ground motion simulation results of Tangshan earthquake are given by using the stochastic finite-fault model. The reliability and applicability of the method is confirmed by comparing with the historical seismic macro-intensity. The results will help improve the seismic design accuracy of the project in areas lacking strong vibration observation records, and have certain reference value and engineering significance for the development of urban earthquake prevention and disaster prevention measures.