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Geometrical characteristics of phase and group velocity surfaces in anisotropic media
Author(s) -
Stovas Alexey,
Roganov Yuriy,
Roganov Vyacheslav
Publication year - 2021
Publication title -
geophysical prospecting
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.735
H-Index - 79
eISSN - 1365-2478
pISSN - 0016-8025
DOI - 10.1111/1365-2478.13030
Subject(s) - anisotropy , azimuth , group velocity , phase velocity , polar , geology , phase (matter) , singularity , inversion (geology) , wave propagation , polar coordinate system , symmetry (geometry) , optics , geometry , physics , mechanics , seismology , mathematics , astronomy , quantum mechanics , tectonics
The phase and group velocity surfaces are essential for wave propagation in anisotropic media. These surfaces have certain features that, especially, for shear waves result in complications for modelling and inversion of recorded wavefields. To analyse wave propagation in an anisotropic model, it is important to identify these features in both the phase and group domains. We propose few characteristics for this analysis: the energy flux angle, decomposed in the polar and azimuth angle correction angles and enhancement factor, which is able to characterize both singularity points and triplication zones. The very simple equation that controls the triplications is derived in the phase domain. The proposed characteristics are illustrated for elastic and acoustic anisotropic models of different symmetry classes.