HR: 1340h
AN: S33A-1086    [Abstracts]
TI: Separation of forward and free surface back-scattered teleseismic wavefields and source signature estimation using the reciprocity theorem and inverse scattering series
AU: * Fan, C
EM: cfan@indiana.edu
AF: Indiana University, Bloomington, 1001 E. 10th Street, Bloomington, IN 47405 United States
AU: Pavlis, G L
EM: pavlis@indiana.edu
AF: Indiana University, Bloomington, 1001 E. 10th Street, Bloomington, IN 47405 United States
AU: Nita, B
EM: bnita@uh.edu
AF: University of Houston, 617 Science & REsearch Bldg 1, Houston, TX 77204 United States
AU: Weglein, A B
EM: aweglein@uh.edu
AF: University of Houston, 617 Science & REsearch Bldg 1, Houston, TX 77204 United States
AB: We separate the forward and free surface (FS) back-scattered teleseismic wavefields using the one-way wavefield reciprocity theorem and a FS effect removal algorithm. With the correlation type reciprocity relation among flux-normalized one-way wavefields, the reflection responses can be generated from the flux-normalized transmission responses. We apply the FS multiple removal algorithm to the reconstructed reflection responses, and derived a variation of the algorithm to recover the transmission responses with FS back-scattered waves removed. The FS back-scattered waves can be obtained by taking the difference of the transmission responses before and after the FS effect removal. The method depends on accurate reconstruction of the reflection response from the transmission response. Consistency of the reconstructed reflection response and separated FS back-scattered waves may prove useful in validation of results. Theoretical and numerical tests for 1D crustal structure with a normal incident plane P wave validate the theory. We are working on using this as a method of source signature estimation using a criterion of best performance of the FS effect removal (e.g. minimum-energy criterion). This holds promise as an alternative to conventional receiver function deconvolution as it could simultaneously provide source signature estimation and separation of forward and FS back-scattered wavefields.
DE: 7203 Body wave propagation
DE: 1734 Seismology
DE: 0629 Inverse scattering
DE: 0900 EXPLORATION GEOPHYSICS
DE: 0935 Seismic methods (3025)
SC: Seismology [S]
MN: 2004 AGU Fall Meeting