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中文摘要：
对汶川Ms8.0级地震主震近场范围地震动进行模拟。模拟采用基于动力学拐角频率的有限断层地震动随机合成方法,即,每个子源的震源谱拐角频率与该子源被触发时已破裂的子源总数相关,同时借助一个能量守恒标度因子弥补动力学拐角频率可能引起的高频地震动幅值水平的低估。震源采用加州理工大学构造观测组CTO反演的有限断层模型。借助加速度反应谱及反应谱比的计算,将模拟得到的52个近场强震观测台站处的地震动,与国家地震台网数据中心提供的主震观测记录进行对比。最后基于对断层附近面积为387.2km×195.2km区域内地震动的模拟,将模拟地震动的峰值加速度分布图与震后调查得到的水平峰值加速度分布图进行分区对比。
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