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Results
ABSTRACT We present the theory of Love wave inversion for shear velocity profiles using phase velocity, group velocity, and shear stress ratio measurements. This theory can be used to setup practical inversion schemes to estimate the near-surface velocity structure in the Earth. The method is founded on the forward modeling method developed by Lysmer (1970) who used a finite-element method to model Rayleigh waves. The advantage of the employed method is that the depth-sensitivity functions needed to calculate the gradients follow from an eigenvalue problem, which can be solved in a fast manner using standard eigenvalue/eigenvector solvers.
- Geophysics > Seismic Surveying > Seismic Processing (1.00)
- Geophysics > Seismic Surveying > Seismic Modeling > Velocity Modeling (1.00)
- Geophysics > Seismic Surveying > Passive Seismic Surveying (0.95)
ABSTRACT We study the use of surface waves to invert for a near-surface shear-wave velocity model and use this model to calculate shear-wave static corrections. We invert both group-velocity and phase-velocity measurements, each of which provide independent information on the shear-wave velocity structure. For the phase-velocity we use both slant-stacking and eikonal tomography to obtain the dispersion curves. We compare models and static solutions obtained from all different methods using field data. For the Coronation field data it appears that the phase-velocity inversion obtains a better estimate of the long-wavelength static than does the group-velocity inversion.
- Geophysics > Seismic Surveying > Seismic Processing (1.00)
- Geophysics > Seismic Surveying > Seismic Modeling > Velocity Modeling > Seismic Inversion (0.93)