SUMMARY An accurate definition of geometry of complex subsurface bodies, such as salt intrusions, is crucial for imaging below such targets. Full-waveform inversion (FWI) is a method for building high-resolution seismic velocity models from nonlinear iterative minimization of the misfit between observed and synthetic seismic data. The ability of FWI to accurately recover the geometry of salt bo...

Full waveform inversion (FWI) has been used to successfully build high-resolution earth velocity models for marine data. For land data sets, FWI using acoustic wave equation (acoustic-FWI) remains challenging due to the lack of modeling of strong surface waves, converted waves, phase dispersion, and near-surface weathering layer distortion. In addition, for land dynamite surveys, the source wav...

STUDY OBJECTIVE To examine the effect of family welfare index (FWI) and maternal education on the probability of infant death. DESIGN A population based multistage stratified clustered survey. SETTING Women of reproductive age in Indonesia between 1983-1997. DATA SOURCES The 1997 Indonesian Demographic and Health Survey. MAIN RESULTS Infant mortality was associated with FWI and maternal...

The objective of seismic full waveform inversion (FWI) is to estimate a model of the subsurface that minimizes the difference between recorded seismic data and synthetic data simulated for that model. Although FWI can yield accurate and high-resolution models, multiple problems have prevented widespread application of this technique in practice. First, FWI is computationally intensive, in part ...

Study objective: To examine the effect of family welfare index (FWI) and maternal education on the probability of infant death. Design: A population based multistage stratified clustered survey. Setting: Women of reproductive age in Indonesia between 1983–1997. Data sources: The 1997 Indonesian Demographic and Health Survey. Main results: Infant mortality was associated with FWI and maternal ed...

The availability of low frequency data is an important factor in the success of full waveform inversion (FWI) in the acoustic regime. The low frequencies help determine the kinematically relevant, low-wavenumber components of the velocity model, which are in turn needed to avoid convergence of FWI to spurious local minima. However, acquiring data below 2 or 3 Hz from the field is a challenging ...

SUMMARY In this study, we develop a strategy for multiparameter FWI for acoustic VTI medium with surface seismic data. Through parameterization analysis and synthetic tests, we find that it is more feasible to invert for the parameterization as vertical and horizontal velocities instead of inverting for the parameterization as vertical velocity and anisotropy fields. We develop a hierarchical a...

Multi-parameter full waveform inversion (FWI) su ers from the complex nonlinearity in the objective function, compounded by the eventual tradeo between the model parameters. A hierarchical approach based on frequency and arrival time data decimation to maneuver the complex nonlinearity associated with this problem usually falls short in anisotropic media. In place of data decimation, I use a mo...

Full waveform inversion (FWI) delivers high-resolution images of the subsurface by minimizing iteratively the misfit between the recorded and calculated seismic data. It has been attacked successfully with the GaussNewton method and sparsity promoting regularization based on fixed multiscale transforms that permit significant subsampling of the seismic data when the model perturbation at each F...