Journal
GEOPHYSICAL JOURNAL INTERNATIONAL
Volume 208, Issue 3, Pages 1567-1578Publisher
OXFORD UNIV PRESS
DOI: 10.1093/gji/ggw465
Keywords
Inverse theory; Surface waves and free oscillations; Seismic tomography
Categories
Funding
- sponsors of the Consortium of Subsurface Imaging and Fluid Modeling (CSIM)
- CRG [OCRF-2014-CRG3-2300]
Ask authors/readers for more resources
We present the theory for wave-equation inversion of dispersion curves, where the misfit function is the sum of the squared differences between the wavenumbers along the predicted and observed dispersion curves. The dispersion curves are obtained from Rayleigh waves recorded by vertical-component geophones. Similar to wave-equation traveltime tomography, the complicated surface wave arrivals in traces are skeletonized as simpler data, namely the picked dispersion curves in the phase-velocity and frequency domains. Solutions to the elastic wave equation and an iterative optimization method are then used to invert these curves for 2-D or 3-D S-wave velocity models. This procedure, denoted as wave-equation dispersion inversion (WD), does not require the assumption of a layered model and is significantly less prone to the cycle-skipping problems of full waveform inversion. The synthetic and field data examples demonstrate that WD can approximately reconstruct the S-wave velocity distributions in laterally heterogeneous media if the dispersion curves can be identified and picked. The WD method is easily extended to anisotropic data and the inversion of dispersion curves associated with Love waves.
Authors
I am an author on this paper
Click your name to claim this paper and add it to your profile.
Reviews
Recommended
No Data Available