The algorithm is implemented in parallel in order to find a large number of solutions that match the data. With this collection of models, the non-uniqueness and uncertainty of the solution to the inverse problem may be estimated using standard statistical techniques. Accomplishments We have obtained a preliminary model of the three-dimensional velocity structure of the entire Earth using seismic arrival times. An iterative Lanczos algorithm has been developed and ported to a massively parallel T3D computer. Map of the seismic velocity variations in the middle of the Earth's outer core.
Red colors signify slower velocities and blue signify regions where the seismic velocity is faster.
We are also considering developing a parallel conjugate gradient routine for rapid inversions. In this algorithm, which will also be written using PVM, the gradient elements are computed in parallel on various processors. Permeability variations in the uppermost 20 ft. of the North Robertson field, Permian Basin, West Texas. Dark colors denote high permeability regions and yellows correspond to low permeability areas. Injection wells are denoted by stars and production wells by circles.