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首页> 外文期刊>Bulletin of the Seismological Society of America >Application of the nearly perfectly matched layer to seismic-wave Propagation Modeling in elastic anisotropic media
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Application of the nearly perfectly matched layer to seismic-wave Propagation Modeling in elastic anisotropic media

机译：几乎完美匹配的层在弹性各向异性介质中地震波传播建模中的应用

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Seismic anisotropy has become a main research topic in both seismic data processing and interpretation (e.g., migration and impedance inversion). As an important part of seismic anisotropy, numerical modeling can help us better understand seismic responses when seismic waves propagate through the interior of the Earth. For the numerical implementation of finite-difference time-domain algorithms, boundary conditions are needed to suppress the spurious reflections from the artificially truncated edges of the discrete model. Here, the nearly perfectly matched layer (NPML) technique is applied to a numerical simulation of seismic-wave propagation in a 2D elastic anisotropic medium, which has been proven to be a very effective absorbing boundary condition in electromagnetic, acoustic, and elastic isotropic media. The equivalence of the wave absorbing performance between the NPML and the standard perfectly matched layer (PML) for elastic wave modeling is theoretically proven in this paper. To check the absorbing ability of the NPML in the cases of grazing incidence and longer simulations (up to 200 s), we choose an elongated anisotropic model in our test. Test results indicate that the NPML has essentially the same computational accuracy as the standard PML but with higher computational savings.
机译：地震各向异性已经成为地震数据处理和解释（例如，偏移和阻抗反演）中的主要研究主题。作为地震各向异性的重要组成部分，数值模型可以帮助我们更好地理解地震波在地球内部传播时的地震反应。对于有限差分时域算法的数值实现，需要边界条件来抑制来自离散模型的人工截断边缘的虚假反射。在这里，将近乎完美匹配的层（NPML）技术应用于二维弹性各向异性介质中地震波传播的数值模拟，这已被证明是在电磁，声学和弹性各向同性介质中非常有效的吸收边界条件。本文从理论上证明了NPML与标准完美匹配层（PML）在弹性波建模方面的吸波性能相当。为了检查在掠食事件和更长的模拟时间（最长200 s）下NPML的吸收能力，我们在测试中选择一个细长的各向异性模型。测试结果表明，NPML具有与标准PML基本相同的计算精度，但具有更高的计算节省量。

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