随机有限断层法合成地震动的研究与应用

目前很多研究者采用随机有限断层模型预测地震动并被证明是可行的.本文运用随机有限断层地震动叠加合成方法,模拟了1988年肃南5.7级地震,与实际记录进行对比分析,发现：用有限断层方法模拟得到的峰值加速度以及峰值加速度出现所对应的特征时刻与真实记录较为吻合;比较模拟的地震动反应谱和实际记录的加速度反应谱,总体上在工程感兴趣的频段内,有限断层方法拟合的结果基本能满足实际工作的需要.为进一步开拓该方法在工程应用中的前景,以兰州市柴家峡水电站为例,将此理论方法应用于缺乏强震记录地区的近场地震动估计中,模拟分析了马衔山北缘活动断裂发震时在坝址区产生的地震动特征,其近场合成结果与1125年兰州7.0级地震的烈度分布符合较好,可供工程抗震设计参考使用.

The study and application of stochastic finite faults method in ground motion synthesizing

Many pursuers have proved that the stochastic finite faults method (SFFM) is a practical method to predict ground motions.In this paper, SFFM is used to simulate strong ground motion of 1988 M5.7 Sunan Earthquake. The comparison proves that the SFFM simulation coincides well with the real time ground motion record in PGA and corresponding eigen time and in the earthquake engineering interested range of frequency SFFM simulation response spectrum generally meets the requirements in practice. To further exploit the application of SFFM in earthquake engineering, it is applied in study of near-source ground motion at Chaijiaxia Hydraulic Power Station in Lanzhou, where strong ground motion record is scarce, to estimate ground motions at the Power Station caused by North Maxianshan Fault. The near-source synthesizing results using SFFM tally well with the intensity map of 1125 M_s 7.0 earthquake in Lanzhou and can be applied in seismic design.