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On the Helmholtz Decomposition in Weakly Anisotropic VTI MediaNormal access

Authors: R. Bloot, J. Schleicher, L.T. Santos and J.C. Costa
Event name: 75th EAGE Conference & Exhibition incorporating SPE EUROPEC 2013
Session: Multi-component Imaging
Publication date: 10 June 2013
DOI: 10.3997/2214-4609.20130714
Organisations: EAGE
Language: English
Info: Extended abstract, PDF ( 420.87Kb )
Price: € 20

Starting from the VTI wave equation, we derive an extension of the Helmholtz decomposition theorem for vector fields to represent the displacement wavefield in a homogeneous weakly anisotropic VTI medium. We show that the elastic wave equation can be transformed into two simple differential equations and a system of two coupled differential equations. The coupled equations system describes the pseudo-acoustic qP wavefield and the other two equations represent the qSV and qSH wavefields, respectively. This constitutes an elegant generalization of known facts about wave propagation in VTI media. Finally, we show how the decomposition can be applied to perform wave-mode separation in VTI media.

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