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首页> 外文期刊>Seismological research letters >Seismic-Hazard Analysis of Long-Period Ground Motion of Megathrust Earthquakes in the Nankai Trough Based on 3D Finite-Difference Simulation
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Seismic-Hazard Analysis of Long-Period Ground Motion of Megathrust Earthquakes in the Nankai Trough Based on 3D Finite-Difference Simulation

机译：基于3D有限差分模拟的南开槽特大推力地震长期地震危险性分析。

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摘要

The 3D wave propagation simulation is suitable for the long-period ground-motion hazard analysis, because the realistic seismic source and velocity structure models are applicable and ground motion at any point can be obtained. However, large-scale simulations for various scenarios are needed to adopt uncertainty due to the source model of a large earthquake. Here we show our approach to overcome a problem of heavy computational expense. We improve computation performance of the 3D finite-difference method by using discontinuous grids and by adapting to multigraphics processing units technique. Then, we simulate long-period ground motion of many scenarios of a hypothetical megathrust earthquake in the Nankai trough. We use the characterized source models based on the "recipe" in the simulation. Finally, we apply the simulation results based on about 400 scenarios to a technical framework of the probabilistic seismic-hazard analysis. The hazard maps of velocity response spectra for a given conditional exceedance probability show that the long-period ground motion is more significant with respect to the underground structure than is the distance from the source area.
机译：3D波传播模拟适用于长期地面运动危害分析，因为可以应用现实的地震源和速度结构模型，并且可以获得任意点的地面运动。但是，由于大地震的震源模型，需要对各种情况进行大规模仿真以采用不确定性。在这里，我们展示了克服大量计算费用的方法。通过使用不连续网格并适应多图形处理单元技术，我们提高了3D有限差分方法的计算性能。然后，我们模拟了南开海槽假想大推力地震许多场景的长期地面运动。我们在仿真中使用基于“配方”的特征化源模型。最后，我们将基于约400种情况的模拟结果应用于概率地震灾害分析的技术框架。对于给定的条件超过概率，速度响应谱的危害图表明，相对于距源区域的距离，地下结构的长周期地震动更为显着。

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