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Geosciences Journal

, Volume 13, Issue 4, pp 407–414 | Cite as

2D time-domain acoustic-elastic coupled modeling: a cell-based finite-difference method

  • Ho-Yong Lee
  • Seung-Chul Lim
  • Dong-Joo Min
  • Byung-Doo Kwon
  • Minkyu Park
Article

Abstract

To describe wave propagation in a fluid-solid environment which is usually encountered during marine seismic exploration, we design a time-domain acoustic-elastic coupled modeling algorithm based on the cell-based finite-difference method. The cellbased method has proven to delineate stress-free conditions correctly at the free surface with just changes in the material properties, which indicates that it can also properly deal with subsurface interface boundaries. In the acoustic-elastic coupled modeling, we first compose finite differences individually for the acoustic and elastic media; we then combine the differences using fluid-solid interface boundary conditions. Numerical experiments show that the cell-based coupled modeling algorithm gives solutions compatible with analytic solutions and that it properly describes S- and converted waves as well as P-waves. Applying the cell-based coupled modeling algorithm to a slope model, we confirm that our coupled modeling algorithm describes irregular interfaces properly, although it employs a staircase approximation of them.

Key words

acoustic-elastic coupled modeling fluid-solid interface cell-based finite-difference method time domain 

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Copyright information

© The Association of Korean Geoscience Societies 2009

Authors and Affiliations

  • Ho-Yong Lee
    • 1
  • Seung-Chul Lim
    • 2
  • Dong-Joo Min
    • 3
  • Byung-Doo Kwon
    • 2
  • Minkyu Park
    • 4
  1. 1.BK21, Division of Energy System EngineeringSeoul National UniversitySeoulRepublic of Korea
  2. 2.Department of Earth Science EducationSeoul National UniversitySeoulRepublic of Korea
  3. 3.Department of Energy Systems EngineeringSeoul National UniversitySeoulRepublic of Korea
  4. 4.Korea Polar Research Institute (KOPRI)IncheonRepublic of Korea

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