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Ground-penetrating radar (GPR) surveys, outcrop measurements, and cores provide a high resolution three-dimensional geologic model to investigate the effects of shales in marine-influenced lower delta-plain distributary channel deposits within the Cretaceous-age Ferron sandstone at Corbula Gulch in central Utah, USA. Shale statistics are computed from(More)
The inclusion of amplitude constraints in body-wave inversions allows the separation of earth models which seem indistinguishable on the basis of travel-time observations. Amplitude constraints can be included through the calculation of synthetic seismograms by the quantized ray theory formulation. As an example, a preliminary model for the velocity(More)
In all media in which the elastic stiffness tensor and density vary in space, an implicit, frequency-dependent anisotropy is present, even if the medium is locally isotropic. This predicts a non-linear, frequency-dependent polarization of body waves, and explains shear-wave splitting in heterogeneous media. Examples are presented for compressional and shear(More)
To decouple the parameters in elastic full-waveform inversion (FWI), we evaluated a new multistep-length gradient approach to assign individual weights separately for each parameter gradient and search for an optimal step length along the composite gradient direction. To perform wavefield extrapolations for the inversion, we used parallelized high-precision(More)
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