Earthquake Motion Simulation with Multiscale Finite-Element Analysis on Hybrid Grid
Earthquake Motion Simulation with Multiscale Finite-Element Analysis on Hybrid Grid
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DOI：
10.1785/0120060175
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发表时间：
2007-08
影响因子：
3
通讯作者：
T. Ichimura;M. Hori;Hiroyuki Kuwamoto
中科院分区：
文献类型：
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作者：
T. Ichimura;M. Hori;Hiroyuki Kuwamoto
强地面运动的高分辨率预报是一项具有挑战性的任务。在本文中，作者提出了基于奇异摄动的多尺度分析和一种新的结构和非结构单元混合有限元方法，用于地震波从断层到地表（包括软表面层）传播的全三维数值模拟。多尺度分析通过考虑地面结构对波传播的影响，改进了低分辨率的解，混合网格从根本上减少了数值计算量。通过与现有方法的数值比较，验证了混合网格有限元方法的有效性和实用性。用该方法解决了一个典型的波传播问题。讨论了该方法的潜在实用性，特别注意了在高空间分辨率下强地震动的计算精度。
The prediction of strong ground motion with high resolution is a challenging task. In this article, the authors propose a multiscale analysis based on a singular perturbation and a new finite-element method with a hybrid of structured and unstructured elements, for a full 3D numerical simulation of earthquake wave propagation from fault to surface, including soft surface layers. The multiscale analysis refines a solution of lower resolution by considering effects of ground structures on wave propagation, and the hybrid grid radically reduces the amount of numerical computation. Several numerical experiments are carried out to show the validity and usefulness of the finite-element method with the hybrid grids, by comparing the results with those obtained using existing methods. An exemplary problem of wave propagation is solved using the proposed method. The potential usefulness of the proposed method is discussed, with particular attention paid to the accuracy of computing strong ground motion with higher spatial resolution.