2-D frequency-domain waveform inversion of coupled acoustic-elastic media with an irregular interface

Myung Hoon Kim, Yun Seok Choi, Young Ho Cha, Changsoo Shin

Research output: Contribution to journalArticlepeer-review

8 Scopus citations

Abstract

In order to correctly interpret marine exploration data, which contain many elastic signals such as S waves, surface waves and converted waves, we have developed both a frequency-domain modeling algorithm for acoustic-elastic coupled media with an irregular interface, and the corresponding waveform inversion algorithm. By applying the continuity condition between acoustic (fluid) and elastic (solid) media, wave propagation can be properly simulated throughout the coupled domain. The arbitrary interface is represented by tessellating square and triangular finite elements. Although the resulting complex impedance matrix generated by finite element methods for the acoustic-elastic coupled wave equation is asymmetric, we can exploit the usual back-propagation algorithm used in the frequency domain through modern sparse matrix technology. By running numerical experiments on a synthetic model, we demonstrate that our inversion algorithm can successfully recover P- and S-wave velocity and density models from marine exploration data (pressure data only).

Original languageEnglish (US)
Pages (from-to)1967-1985
Number of pages19
JournalPure and Applied Geophysics
Volume166
Issue number12
DOIs
StatePublished - Jan 1 2009

Keywords

  • Acoustic-elastic coupled media
  • Finite-element method
  • Frequency-domain
  • Waveform inversion

ASJC Scopus subject areas

  • Geophysics
  • Geochemistry and Petrology

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