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http://dx.doi.org/10.7582/GGE.2012.15.3.121

Application and Improvement of Complex Frequency Shifted Perfectly Matched Layers for Elastic Wave Modeling in the Frequency-domain  

Son, Min-Kyung (Earthquake Research Center, Korea Institute of Geoscience and Mineral Resources)
Cho, Chang-Soo (Earthquake Research Center, Korea Institute of Geoscience and Mineral Resources)
Publication Information
Geophysics and Geophysical Exploration / v.15, no.3, 2012 , pp. 121-128 More about this Journal
Abstract
Absorbing boundary conditions are used to mitigate undesired reflections that can arise at the model's truncation boundaries. We apply a complex frequency shifted perfectly matched layer (CFS-PML) to elastic wave modeling in the frequency domain. Modeling results show that the performance of our implementation is superior to other absorbing boundaries. We consider the coefficients of CFS-PML to be optimal when the kinetic energy becomes to the minimum, and propose the modified CFS-PML that has the CFS-PML coefficient ${\alpha}_{max}$ defined as a function of frequency. Results with CFS-PML and modified CFS-PML are significantly improved compared with those of the classical PML technique suffering from large spurious reflections at grazing incidence.
Keywords
CFS-PML; frequency-domain; FEM; elastic wave modeling;
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