采用随机有限断层法生成最大可信地震

回顾了基于地震学理论的合成地震动的随机方法，以及能够细致描述震源复杂性的有限断层模型，将其作为最大可信地震的研究方向。重点比较随机有限断层法的静拐角频率和动拐角频率理论。基于静拐角频率方法开发Fortran程序SFFMSIM，并引进Motazedian和Atkinson编制的动拐角频率程序EXSIM，选用1994年美国西部Northridge地震检验随机有限断层模拟方法及两套程序。最后以大岗山水电站工程为例，采用随机有限断层模型计算磨西断裂发震时工程场址可能产生的地震动。

Generation of the maximum credible earthquake by using the stochastic finite fault method

A research direction is determined for the maximum credible earthquake by reviewing the stochastic method of ground motion simulation based on seismology theory and finite fault source model which can describe the complexity of the earthquake source. Stochastic finite fault method respectively based on the theories of static corner frequency and dynamic corner frequency are compared particularly. According to the theory of static corner frequency, a Fortran program SFFMSIM is developed in this paper. EXSIM, a program based on the theory of dynamic corner frequency and provided by Motazedian and Atkinson, is introduced for comparison. Northridge Earthquake in 1994 is chosen to inspect the stochastic finite fault method of ground motion simulation and the above mentioned two sets of procedures. Taking Dagangshan hydropower project as an example, artificial accelerograms generated from the rupture of Moxi fault and recorded at the dam site are simulated by the stochastic finite fault method.