HR: 0800h
AN: S41C-1015    [Abstracts]
TI: Direct Waveform Inversion by Iterative Inverse Propagation
AU: * Schlottmann, R B
EM: briansch@fusemail.com
AF: No current affiliation, 4411 Stoneyglen Ct., Moorpark, CA 93021
AB: Seismic waves are the most sensitive probe of the Earth's deep interior we have. Unfortunately, relating surface recordings of these waves to Earth structure is non-trivial. Most techniques used are some variant of tomography and as such use only a small amount of the information contained in the full seismogram and result in relatively low resolution images. Others use a larger amount of the seismogram but require either the use of an arbitrarily selected misfit function, a statistical search over models, or both. We present the development of a new approach to waveform inversion, i.e., inversion which uses the complete seismogram. This new method is based on a highly non-linear Fredholm integral equation relating the Earth structure to itself and to the recorded seismograms. An iterative solution to this equation is proposed. The resulting algorithm is numerically intensive but is deterministic, i.e., random searches of model space are not required. In addition, no misfit function is needed. Numerical tests in 1D have shown remarkably good results. We will present these and newer tests in 2D acoustic media.
DE: 7260 Theory
DE: 7270 Tomography (6982, 8180)
DE: 7290 Computational seismology
SC: Seismology [S]
MN: Fall Meeting 2005