SIMULATION OF HORIZONTAL BEDROCK GROUND MOTION
PARAMETERS BY TWO-DIMENSIONAL FINITE ELEMENT
METHOD AND VERIFICATION
1）First Crust Monitoring and Application Center，CEA，Tianjin 300180
2）Key Laboratory of Earthquake Geodesy，Institute of Seismology，CEA，Wuhan 430071
3）Wuhan Base of Institute of Crustal Dynamics，CEA，Wuhan 430071
4）China Coal Pingshuo Group Co.Ltd，Shuozhou 036000
Abstract Horizontal bedrock ground motion parameters are important for the seismic safety evaluation of engineering sites.The contact algorithm were applied to construct 2dimension FEM simulation model which included the active faults.We considered the focal mechanism solution to explore a proper scenario earthquake parameter setting for NGA model in order to supply the input time history.Dynamic FEM method were used to calculate the PGA and Sa(T）which had considered the source characteristics and dielectric characteristics.We use Tangshan M4.7 Earthquake in 2012 to verify the method，and the comparison of FEM and observations in time or frequency domain proved that the method was promising.We also find that the bedrock ground motion PGA on both sides of the fault distributes discontinuously.
