Nonreflecting boundary condition in finite-element formulation for an elastic wave equation
Nonreflecting boundary condition in finite-element formulation for an elastic wave equation
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DOI：
10.1190/1.1444378
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发表时间：
1998-06
期刊：
影响因子：
3.3
通讯作者：
G. Sarma;K. Mallick;V. R. Gadhinglajkar
中科院分区：
文献类型：
--
作者：
G. Sarma;K. Mallick;V. R. Gadhinglajkar
用有限差分或有限元方法对地震波场进行数值模拟需要将模型截断到有限的计算域。众所周知，这种截断模型的边缘在合成地震图上产生边界反射。成功的数值模拟的一个重要步骤是消除这些反射。我们提出了一个简单的方案，在计算合成时消除这种边界反射。我们还证明了我们的方法在各种地质模型上的有效性和鲁棒性。
Numerical modeling of seismic wavefields using finite-difference or finite-element methods requires truncation of the model to finite computational domains. It is well known that the edges of such truncated models give boundary reflections on the synthetic seismograms. An essential step to successful numerical modeling is to eliminate these reflections. We present a simple scheme that eliminates such boundary reflections when computing synthetics. We also demonstrate the efficiency and robustness of our method on a variety of geological models.