High-Frequency Nonlinear Earthquake Simulations on Petascale Heterogeneous Supercomputers
High-Frequency Nonlinear Earthquake Simulations on Petascale Heterogeneous Supercomputers
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DOI：
10.1109/sc.2016.81
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发表时间：
2016-11
期刊：
影响因子：
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通讯作者：
D. Roten;Yifeng Cui;K. Olsen;S. Day;K. Withers;W. Savran;Peng Wang;D. Mu
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文献类型：
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作者：
D. Roten;Yifeng Cui;K. Olsen;S. Day;K. Withers;W. Savran;Peng Wang;D. Mu
在大规模3D地面运动估计中忽略非线性效应，由于内存和可扩展性问题，这是特别具有挑战性的，可能会导致地震多发地区的结构设计代价高昂的误导。我们在AWP-ODC中使用Drucker-Prager屈服条件实现了非线性，并进一步优化了CUDA内核，以更有效地利用GPU的内存带宽。该应用程序已导致模型区域的显着增加和最先进的地震模拟在现实的地球结构中的准确性，现在能够解决与最脆弱的建筑物（> 1 Hz）相关的频率下的波场，同时保持该方法的可扩展性和效率。我们成功地在NCSA Blue沃茨和OLCF Titan上的4，200个Kepler K20 X GPU上运行了代码，以模拟圣安德烈亚斯断层南部的M7.7地震，空间分辨率为25 m，频率高达4 Hz。
The omission of nonlinear effects in large-scale 3D ground motion estimation, which are particularly challenging due to memory and scalability issues, can result in costly misguidance for structural design in earthquake-prone regions. We have implemented nonlinearity using a Drucker-Prager yield condition in AWP-ODC and further optimized the CUDA kernels to more efficiently utilize the GPU's memory bandwidth. The application has resulted in a significant increase in the model region and accuracy for state-of-the-art earthquake simulations in a realistic earth structure, which are now able to resolve the wavefield at frequencies relevant for the most vulnerable buildings (> 1 Hz) while maintaining the scalability and efficiency of the method. We successfully run the code on 4,200 Kepler K20X GPUs on NCSA Blue Waters and OLCF Titan to simulate a M 7.7 earthquake on the southern San Andreas fault with a spatial resolution of 25 m for frequencies up to 4 Hz.