HR: 09:15h
AN: S31A-04    [Abstracts]
TI: Interferometric techniques in seismic reflection imaging and the principle of stationary phase
AU: * Snieder, R
EM: snieder@mines.edu
AF: Center for Wave Phenomena Colorado School of Mines, 1500 Illinois Street, Golden, CO 80401-1887 United States
AB: Interferometric imaging where the Green's function is constructed using the correlation of complex wavefields recorded at two receivers is a rapidly emerging field. The methodology has been justified based on assumptions of equiparitioning of the normal modes of the system, as well as on various versions of the representation theorem applied to time-reversed waves. I will present another point of view that is based on stationary phase arguments. This complementary formulation of interferometric imaging gives insight in the physics of the emergence of the Green's function, and of the limitations that are encountered when applying this technique to data. Issues that will be covered are the relation between ensemble averaging and time averaging, and interferometric imaging of reflected waves. This example is of particular interest for exploration seisology since it shows that interferometric imaging may introduce spurious multiple reflections. I will show that these "multiples" have a clear physical interpretation and do not form a problem in seismic imaging.
DE: 0935 Seismic methods (3025)
DE: 7203 Body wave propagation
DE: 7260 Theory and modeling
SC: Seismology [S]
MN: 2005 Joint Assembly