Ground-Motion Simulation for the 2008 Wenchuan, China, Earthquake Using the Stochastic Finite-Fault Method
Ground-Motion Simulation for the 2008 Wenchuan, China, Earthquake Using the Stochastic Finite-Fault Method
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DOI：
10.1785/0120090258
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发表时间：
2009-12
影响因子：
3
通讯作者：
H. Ghasemi;Y. Fukushima;K. Koketsu;H. Miyake;Zifa Wang;John G. Anderson
中科院分区：
文献类型：
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作者：
H. Ghasemi;Y. Fukushima;K. Koketsu;H. Miyake;Zifa Wang;John G. Anderson
摘要利用Beresnev和Atkinson（1997，1998 b）提出的随机有限断层法对2008年汶川地震（Mw7.9）记录到的强地震动进行了模拟。对两种源模型进行了模拟。这两种模型都是基于Koketsu等人（2008年）通过反演地震体波数据提出的断层几何形状。通过该反演获得的滑移分布用于第一源模型，而随机滑移分布用于第二源模型。通过计算各模型预测反应谱的偏差和标准差，量化了各模型的性能。对于第一个源模型，结果表明，在0.05-1 s以及4-10 s的周期范围内，模拟和观测反应谱之间的总体一致性，但该模型高估了1-4 s周期范围内的地面运动。对于第二个源模型，该模型在较长时期的稍宽时期范围内有偏差。随机模型预测观测到的地面运动的性能也比较了几个经验地面运动模型通过统计工具。
Abstract Strong ground motions recorded during the 2008 Wenchuan, China, earthquake ( M w 7.9) have been simulated using the stochastic finite-fault method proposed by Beresnev and Atkinson (1997, 1998b). The simulations were made for two source models. Both models are based on the fault geometry that was proposed by Koketsu et al. (2008) through inversion of teleseismic body wave data. The slip distribution obtained by this inversion was used for the first source model, while a random slip distribution was used for the second source model. The performance of each source model is quantified by calculating the bias and standard deviation of response spectra predicted by each model. For the first source model, the results show overall agreement between the simulated and observed response spectra in a period range of 0.05–1 s, as well as 4–10 s, but the model overpredicts ground motions in a period range of 1–4 s. For the second source model, the model is biased over a slightly wider period range at longer periods. The performance of the stochastic model to predict observed ground motions is also compared with several empirical ground-motion models by means of statistical tools.