HR: 08:40h
AN: S51E-03    [Abstracts]
TI: Numerical Invesigation of Migration Imaging Resolution
AU: * Fehler, M
EM: fehler@lanl.gov
AF: Geophysics Group; Los Alamos National Laboratory, MS D443 PO Box 1663, Los Alamos, NM 87545 United States
AU: Huang, L
EM: sato@zisin.Geophys.Tohoku.ac.jp
AF: Geophysics Group; Los Alamos National Laboratory, MS D443 PO Box 1663, Los Alamos, NM 87545 United States
AU: Wu, R
EM: wrs@emerald.ucsc.edu
AF: Modeling and Imaging Laboratory, IGPP University of California at Santa Cruz, Santa Cruz, CA 95064 United States
AU: Xie, X
EM: xie@emerald.ucsc.edu
AF: Modeling and Imaging Laboratory, IGPP University of California at Santa Cruz, Santa Cruz, CA 95064 United States
AB: The resolution of seismic migration imaging resolution is often given as some function of the data aperture, the size of the Fresnel zone at a given location, the frequency of the data used in the migration and the illumination of the target region. However, other issues limit image resolution or distort the image. For example, the velocity model is generally not reliably known and variations of the model from the true structure can have a significant impact on image quality, as well as reduce the image focus. Another factor that limits resolution is the type of propagator used in the migration imaging. To compare the resolution of images obtained when using ray-based Kirchhoff migration with that obtained from wave equation migration, we developed a heterogeneous model which can be numerically simulated. Migrations obtained for the numerical dataset show the improvements that can be obtained when using wave equation imaging.
DE: 7260 Theory and modeling
DE: 7294 Instruments and techniques
DE: 7200 SEISMOLOGY
SC: Seismology [S]
MN: 2004 AGU Fall Meeting