HR: 0830h
AN: S41B-05    [Abstracts]
TI: Seismic Image Reconstruction by Reducible Transformations
AU: * Sarwar, A K
EM: asarwar@uno.edu
AF: University of New Orleans, Department of Geology and Geophysics, 2000 Lakeshore Drive, New Orleans, LA 70148 United States
AB: Diffractions of seismic wave cause distortions and misplacements of subsurface structures in the reflection seismograms. A reasonable reconstruction of complex geometry, existing below the Earth's surface in multi-dimension, is possible if there is a reducible transformation, which can be based on wave-theoretical foundations. One such is a Radon transformation used with success in medical imaging. Several authors applied the projection and back-projection ideas inherent in Radon (also known as Tau-P) transformation for seismic imaging. This paper presents a new non-recursive approach implemented at every point in the transform domain with a threshold operator. The approach in this paper is based on a double Radon transformation of the seismic reflection data as a function of midpoint, offset, and time. In the back projection step, the intercept time is modified using midpoint, offset, and velocity. Satisfactory implementation on synthetic data is presented for a vertically inhomogeneous medium with some lateral velocity variation.
DE: 7200 SEISMOLOGY
DE: 7260 Theory and modeling
DE: 7299 General or miscellaneous
SC: Seismology [S]
MN: 2005 Joint Assembly