Prestack migration is necessary before AVO analysis. Most of the present migration algorithms not only try to focus the reflections on the subsurface but also strive to preserve the amplitude for subsequent amplitude studies. A migration/inversion method developed by Lumley (1993) estimates the angle dependent reflectivity at each subsurface point by using least-squares Kirchhoff migration foll...

A key challenge in the seismic imaging of reflectors using surface reflection data is the subsurface illumination produced by a given data set and for a given complexity of the background model (of wavespeeds). The imaging is described here by the generalized Radon transform. To address the illumination challenge and enable (accurate) local parameter estimation, we develop a method for partial ...

Purified human neutrophils from 48 individuals were tested for their capacity to kill antibody-coated target cells in vitro in the absence or presence of stimulating agents. The agents used to stimulate cytotoxic capacity were the monoclonal antibody (MAb) WEM-G1, colony-stimulating factor (CSF-alpha), or mononuclear cell supernatant (MNC-SN). There existed an heterogeneity among the neutrophil...

It is well-known that standard migration is not a true inverse operation and is based on the adjoint of the forward modeling operator. Due to this approximation the resulting migrated image can often suffer from various artifacts and uneven illumination issues, especially in regions of complex geology. Least-squares depth migration approximates the inverse of the forward modeling and can be use...