Author(s): Gao Yang, Pan Hua, Wang Suyun
Pages: 698-710
Year: 2014 Issue:  4
Journal: Acta Seismologica Sinica
Keyword:  stochastic finite-fault method; near field; moderate-strong earth-quake; parametric sensitivity;
Abstract: This paper described stochastic finite-fault method and related im-provements which have been widely used in simulating acceleration time histo-ries.The improved method is more suitable for the simulation of moderate-strong earthquakes.And then we compared the time histories and average PSA (pseudo-acceleration response spectra ) of near-fault moderate-strong earth-quakes for different site azimuths so as to analyze parametric sensitivity quanti-tatively to near-fault ground-motion simulations for moderate-strong earth-quakes using the revised program.The results show that PSA values are appar-enly different at short period for different site azimuths,and stress drop is the most important model parameter,which controls response spectra at short peri-od.In addition,the geometric-spreading coefficient has a significant impact on PSA.Therefore,in order to get more accurate simulations for the near-fault moderate-strong earthquakes we should focus on stress drop and geometric-spreading coefficient which have great influence on PSA values at short period when applying stochastic finite-fault method to the seismic safety evaluation of moderate earthquakes.And the distribution of dominating site azimuths is an-other factor which should also be considered in this situation.