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Inversion for seismic anisotropy using genetic algorithms 1
Author(s) -
Horne Steve,
MacBeth Colin
Publication year - 1994
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/j.1365-2478.1994.tb00249.x
Subject(s) - geology , inversion (geology) , shear wave splitting , anisotropy , azimuth , algorithm , shear (geology) , seismology , geometry , physics , mathematics , optics , petrology , tectonics
A general inversion scheme based on a genetic algorithm is developed to invert seismic observations for anisotropic parameters. The technique is applied to the inversion of shear‐wave observations from two azimuthal VSP data sets from the Conoco test site in Oklahoma. Horizontal polarizations and time‐delays are inverted for hexagonal and orthorhombic symmetries. The model solutions are consistent with previous studies using trial and error matching of full waveform synthetics. The shear‐wave splitting observations suggest the presence of a shear‐wave line singularity and are consistent with a dipping fracture system which is known to exist at the test site. Application of the inversion scheme prior to full waveform modelling demonstrates that a considerable saving in time is possible whilst retaining the same degree of accuracy.