CAJ | 학술논문

介绍了模拟地震动时程的随机有限断层法及近年来对该方法的改进，改进后的随机有限断层法适合模拟中强地震；比较了不同场地方位角的中强地震近场地震动时程与平均伪加速度反应谱（PSA）；定量分析了中强地震近场地震动模拟结果的参数敏感性。结果表明：不同场地方位角的中强地震近场 PSA 在短周期部分差别较大；应力降是模型中最重要的参数，其对反应谱短周期部分影响最大；几何扩散系数对 PSA 的整体影响也较为明显。将随机有限断层法应用到工程安全性评价工作中时，应当重点关注对反应谱短周期部分影响较大的应力降和该区域的几何扩散系数，同时要调查该区域优势场地方位角的分布，更加合理地控制中强地震近场强震动的模拟。
개소료모의지진동시정적수궤유한단층법급근년래대해방법적개진，개진후적수궤유한단층법괄합모의중강지진；비교료불동장지방위각적중강지진근장지진동시정여평균위가속도반응보（PSA）；정량분석료중강지진근장지진동모의결과적삼수민감성。결과표명：불동장지방위각적중강지진근장 PSA 재단주기부분차별교대；응력강시모형중최중요적삼수，기대반응보단주기부분영향최대；궤하확산계수대 PSA 적정체영향야교위명현。장수궤유한단층법응용도공정안전성평개공작중시，응당중점관주대반응보단주기부분영향교대적응력강화해구역적궤하확산계수，동시요조사해구역우세장지방위각적분포，경가합리지공제중강지진근장강진동적모의。
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.