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Anisotropic elastic finite-difference modeling of sources and receivers on Lebedev grids
Geophysics ( IF 3.3 ) Pub Date : 2021-02-05 , DOI: 10.1190/geo2020-0522.1
Erik F. M. Koene 1 , Johan O. A. Robertsson 1 , Fredrik Andersson 1
Affiliation  

The Lebedev grid finite-difference (FD) method allows modeling of anisotropic elastic-wave propagation. On Lebedev grids, erroneous point-source excitations can create spurious (nonphysical) waves. The only known remedy for such artifacts in the literature is the Lisitsa-Vishnevsky method. This method uses a distributed array to create point sources and point receivers on the FD grid. However, the Lisitsa-Vishnevsky method does not fully eliminate spurious artifacts. A novel approach is found in the FD-consistent point source, which suppresses spurious artifacts entirely. The method requires no array recording to create point receivers. The advantage of this method over the Lisitsa-Vishnevsky method is determined with two anisotropic modeling examples.

中文翻译:

Lebedev网格上源和接收器的各向异性弹性有限差分建模

Lebedev网格有限差分(FD)方法允许对各向异性弹性波传播进行建模。在列别捷夫网格上,错误的点源激发会产生虚假(非物理)波。文献中对此类伪影的唯一已知补救方法是Lisitsa-Vishnevsky方法。此方法使用分布式阵列在FD网格上创建点源和点接收器。但是,Lisitsa-Vishnevsky方法不能完全消除伪像。在FD一致点源中发现了一种新颖的方法,该方法可以完全抑制伪造的伪像。该方法不需要阵列记录即可创建点接收器。通过两个各向异性建模示例确定了该方法相对于Lisitsa-Vishnevsky方法的优势。
更新日期:2021-02-07
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