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Love-wave waveform inversion for shallow shear-wave velocity using a conjugate gradient algorithm

Pan, Yudi; Xia, Jianghai; Xu, Yixian; Gao, Lingli; Xu, Zongbo


High-frequency surface-wave techniques are widely used to estimate S-wave velocity of near-surface materials. Surface-wave methods based on inversions of dispersion curves are only suitable to laterally homogeneous or smoothly laterally varying heterogeneous earth models due to the layered-model assumption during calculation of dispersion curves. Waveform inversion directly fits the waveform of observed data, and it can be applied to any kinds of earth models. We have used the Love-wave waveform inversion in the time domain to estimate near-surface S-wave velocity. We used the finite-difference method as the forward modeling method. The source effect was removed by the deconvolution technique, which made our method independent of the source wavelet. We defined the difference between the deconvolved observed and calculated waveform as the misfit function. We divided the model into different sizes of blocks depending on the resolution of the Love waves, and we updated the S-wave velocity of each block via a conjugate gradient algorithm. We used two synthetic models to test the effectiveness of our method. A real-world case verified the validity of our method.

DOI: 10.1190/geo2014-0225.1
Zitationen: 53
Web of Science
Zitationen: 40
Zitationen: 47
Zugehörige Institution(en) am KIT Geophysikalisches Institut (GPI)
KIT-Zentrum Klima und Umwelt (ZKU)
Publikationstyp Zeitschriftenaufsatz
Publikationsjahr 2016
Sprache Englisch
Identifikator ISSN: 0016-8033, 1942-2156
KITopen-ID: 1000059089
Erschienen in Geophysics
Verlag Society of Exploration Geophysicists (SEG)
Band 81
Heft 1
Seiten R1-R14
Nachgewiesen in Scopus
Web of Science
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