【摘要】 利用复合震源模型和人工合成地震图的算法,以1679年三河—平谷Ms8.0地震为例,计算了北京地区的宽频带强地面运动.其结果可为今后该地区的地震危险性评估和工程抗震提供一定的物理参数.通过考察该地区的地质与地球物理区域背景,利用计算机数值模拟的方法,对北纬39.3°~41.1°、东经115.35°~117.55°所围限的北京范围进行了设定地震的仿真模拟,并合成了强地面运动.通过分析影响强地面运动的几个关键因素,给出了北京地区强地面运动峰值加速度和速度分布特征,比较了合成强地面运动记录与通过衰减关系计算所得的结果.同时,还对复合震源模型的优点和局限性给出了充分的讨论.利用数值模拟方法所得的较为真实的强地面运动参数,即加速度、速度、位移和时程特征,可为北京地区工程建设的抗震设计、救援设施的选址、以及金融及保险部门的风险性评估提供一定的依据.更多还原

【Abstract】 In this study, a composite source model has been used to calculate the realistic strong ground motions in Beijing area, caused by 1679 MS8.0 earthquake in Sanhe-Pinggu. The results could provide us the useful physical parameters for the future seismic hazard analysis in this area. Considering the regional geological/geophysical background, we simulated the scenario earthquake with an associated ground motions in the area ranging from 39.3°N to 41.1°N in latitude and from 115.35°E to 117.55°E in longitude. Some of the key factors which could influence the characteristics of strong ground motion have been discussed, and the resultant peak ground acceleration (PGA) distribution and the peak ground velocity (PGV) distribution around Beijing area also have been made as well. A comparison of the simulated result with the results derived from the attenuation relation has been made, and a sufficient discussion about the advantages and disadvantages of composite source model also has been given in this study. The numerical results, such as the PGA, PGV, peak ground displacement, and the three-component time-histories developed for Beijing area, have a potential application in earthquake engineering field and building code design, especially for the evaluation of critical constructions, government decision making and the seismic hazard assessment by financial/insurance companies.更多还原