Journal Article

Finite-difference modelling of wavefield constituents

Johan O.A. Robertsson, Dirk-Jan van Manen, Cedric Schmelzbach, Cederic Van Renterghem and Lasse Amundsen

in Geophysical Journal International

Volume 203, issue 2, pages 1334-1342
ISSN: 0956-540X
Published online October 2015 | e-ISSN: 1365-246X | DOI: http://dx.doi.org/10.1093/gji/ggv379
Finite-difference modelling of wavefield constituents

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The finite-difference method is among the most popular methods for modelling seismic wave propagation. Although the method has enjoyed huge success for its ability to produce full wavefield seismograms in complex models, it has one major limitation which is of critical importance for many modelling applications; to naturally output up- and downgoing and P- and S-wave constituents of synthesized seismograms. In this paper, we show how such wavefield constituents can be isolated in finite-difference-computed synthetics in complex models with high numerical precision by means of a simple algorithm. The description focuses on up- and downgoing and P- and S-wave separation of data generated using an isotropic elastic finite-difference modelling method. However, the same principles can also be applied to acoustic, electromagnetic and other wave equations.

Keywords: Numerical solutions; Theoretical seismology; Wave scattering and diffraction; Wave propagation

Journal Article.  4660 words.  Illustrated.

Subjects: Volcanology and Seismology

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