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Application of a complete workflow for 2D elastic full-waveform inversion to recorded shallow-seismic Rayleigh waves

Groos, Lisa; Schäfer, Martin; Forbriger, Thomas; Bohlen, Thomas

Abstract (englisch):
The S-wave velocity of the shallow subsurface can be inferred
from shallow-seismic Rayleigh waves. Traditionally, the disper-
sion curves of the Rayleigh waves are inverted to obtain the (local)
S-wave velocity as a function of depth. Two-dimensional elastic
full-waveform inversion (FWI) has the potential to also infer
lateral variations. We have developed a novel workflow for the
application of 2D elastic FWI to recorded surface waves. During
the preprocessing, we apply a line-source simulation (spreading
correction) and perform an a priori estimation of the attenuation
of waves. The iterative multiscale 2D elastic FWI workflow con-
sists of the preconditioning of the gradients in the vicinity of the
sources and a source-wavelet correction. The misfit is defined
by the least-squares norm of normalized wavefields. We apply our
workflow to a field data set that has been acquired on a predomi-
nantly depth-dependent velocity structure, and we compare the
reconstructed S-wave velocity model with the result obtained
by a 1D inversion based on wavefield spectra (Fourier-Bessel ex-
pansion coefficients). The 2D S-wave vel ... mehr

Zugehörige Institution(en) am KIT Geophysikalisches Institut (GPI)
Publikationstyp Zeitschriftenaufsatz
Jahr 2017
Sprache Englisch
Identifikator DOI: 10.1190/GEO2016-0284.1
ISSN: 0016-8033, 1942-2156
KITopen ID: 1000067353
Erschienen in Geophysics
Band 82
Heft 2
Seiten R109-R117
Projektinformation BMBF, 03G0752A
Schlagworte full-waveform inversion, Rayleigh waves, shallow seismics
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