2.5D modelling of elastic waves in transversely isotropic media using the spectral element method

Catherine Sinclair, Stewart Greenhalgh, Bing Zhou

Research output: Contribution to journalArticlepeer-review

17 Scopus citations

Abstract

The spectral-element method provides an accurate alternative to the finite-element method for modelling elastic waves in anisotropic media. With the aim of reducing the high computational overheads of 3D modelling, we have implemented 2.5D spectral-element modelling of elastic waves, initially for vertically transversely isotropic media, and then extended to a tilted transversely isotropic medium with a dipping symmetry-axis. We have investigated different categories of absorbing boundaries to minimise artificial boundary reflections, including viscous boundary conditions and two distinct 2.5D formulations of perfectly matched layers (PMLs). Both PML methods use complex coordinate stretching, but the first method is only applicable in the frequency-domain. The other method uses the decomposed gradient operator and can be applied in both the time-domain and frequency-domain. Traditional 2D modelling exhibits cylindrical wave propagation characteristics from a line source. Our 2.5D modelling results, presented as images of seismic wavefields, illustrate the more realistic spherical propagation from a point source.

Original languageBritish English
Pages (from-to)225-234
Number of pages10
JournalExploration Geophysics
Volume38
Issue number4
DOIs
StatePublished - Dec 2007

Keywords

  • Anisotropic
  • Elastic
  • Implementation
  • Seismic modelling
  • Spectral element

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