HR: 0830h
AN: S11E-0353    [PDF]
TI: Multiparameter Inversion of Forward Scattered Teleseismic Data Using an Inverse Scattering Series Method
AU: * Fan, C
EM: cfan@indiana.edu
AF: Department of Geological Sciences, Indiana University, Bloomington, 1005 E. 10th street, Bloomington, IN 47405 United States
AU: Pavlis, G L
EM: pavlis@indiana.edu
AF: Department of Geological Sciences, Indiana University, Bloomington, 1005 E. 10th street, Bloomington, IN 47405 United States
AU: Weglein, A B
EM: aweglein@uh.edu
AF: Department of Physics, University of Houston, Science & Research Bldg 1, Houston, TX 77204 United States
AU: Zhang, H
EM: yanhz@yahoo.com
AF: Department of Physics, University of Houston, Science & Research Bldg 1, Houston, TX 77204 United States
AB: A new approach is presented to invert the elastic properties of the earth from forward scattered teleseismic data using an inverse scattering series method. The forward problem is cast as the Born series in terms of Green's function in the reference medium and perturbations to material properties. The scattered wavefield can be described by the summation of terms of the Born series, in which the first term is the Born approximation. We are investigating the use of the inverse scattering series to solve the inverse problem for forward scattered body waves. Inverting for the first term in the inverse scattering series is the linear inversion approach on which most migration methods are founded. When the contrast of the reference and actual media is big, higher order terms of the inverse scattering series can be expected to correct the linearized inverted elastic properties closer to those of the actual medium. Thus, this algorithm is nonlinear and can be used for inverting the elastic properties in complex conditions with the practical seismic array geometry using an initial model with constant elastic properties. The inversion formula involves four different scattering modes (PP, PS, SS, SP) that contribute to the recovery of the earth either separately or in a whole. The equations of the first two terms in the inverse scattering series have been developed and work on higher order terms is in progress.
DE: 0900 EXPLORATION GEOPHYSICS
DE: 0935 Seismic methods (3025)
DE: 3200 MATHEMATICAL GEOPHYSICS (New field)
DE: 3260 Inverse theory
DE: 7200 SEISMOLOGY
SC: Seismology [S]
MN: 2003 Fall Meeting