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

주파수영역 탄성파모델링에 대한 CFS-PML경계조건의 적용 및 개선

  • 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)
  • 손민경 (한국지질자원연구원 지진연구센터) ;
  • 조창수 (한국지질자원연구원 지진연구센터)
  • Received : 2012.05.17
  • Accepted : 2012.07.23
  • Published : 2012.08.31

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.

Acknowledgement

Grant : 한반도 동부지역 잠재적 위험 지진원 평가

Supported by : 한국지질자원연구원

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