A new hybrid numerical scheme for modelling elastodynamics in unbounded media with near-source heterogeneities
A new hybrid numerical scheme for modelling elastodynamics in unbounded media with near-source heterogeneities
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一种新的混合数值方案，用于模拟具有近源异质性的无界介质中的弹性动力学
DOI：
10.1093/gji/ggx337
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发表时间：
2017
影响因子：
2.8
通讯作者：
A. Elbanna
中科院分区：
文献类型：
--
作者：
Setare Hajaroalsvadi;A. Elbanna
有限差分（FD）和谱边界积分（SBI）方法在各种工程和地球物理应用中被广泛用于模拟自发传播的剪切裂缝。在本文中，我们提出了一种新的建模方法，该方法通过边界牵引力和位移的一致交换将这两种方法结合起来。利用FD的灵活性和谱边界积分（SBI）方法的高效性，所提出的混合方案将以高效的计算方式解决广泛的问题。我们用两个动态破裂传播的例子证明了该方法的有效性：一个是在低速层存在的情况下，另一个是允许断层外塑性的情况下。我们讨论了混合方案在地震周期模拟中的潜在用途，以及精确的吸收边界条件
The Finite Difference (FD) and the Spectral Boundary Integral (SBI) methods have been used extensively to model spontaneously propagating shear cracks in a variety of engineering and geophysical applications. In this paper, we propose a new modeling approach, in which these two methods are combined through consistent exchange of boundary tractions and displacements. Benefiting from the flexibility of FD and the efficiency of spectral boundary integral (SBI) methods, the proposed hybrid scheme will solve a wide range of problems in a computationally efficient way. We demonstrate the validity of the approach using two examples for dynamic rupture propagation: one in the presence of a low velocity layer and the other in which off-fault plasticity is permitted. We discuss possible potential uses of the hybrid scheme in earthquake cycle simulations as well as an exact absorbing boundary condition