HR: 1340h
AN: S53B-1266    [Abstracts]
TI: Spurious arrivals in seismic interferometry
AU: * Snieder, R
EM: rsnieder@mines.edu
AF: Colorado School of Mines, Center for Wave Phenomena 1500 Illinois Str., Golden, CO 80401, United States
AU: van Wijk, K
EM: kasper@cgiss.boisestate.edu
AF: Boise State University, MG206E, 1910 University Dr., Boise, ID 83725-1536, United States
AU: Haney, M
EM: zanyhaney@gmail.com
AF: USGS Alaska Volcano Observatory, 4200 University Dr., Anchorage, AK 99508, United States
AB: Seismic interferometry makes it possible to extract the Green's function that accounts for wave propagation between receivers from the cross-correlation of field fluctuations recorded at those receivers. In principe, the full Green's function can be obtained, but we show examples that interferometry may lead to spurious arrivals due to cross-terms between different arrivals that do not correspond real physical arrivals. In the examples that we present, these spurious arrivals vanish when a full coverage of noise sources is present. In practical situations, noise sources, as required by theory, do not cover a closed surface around receivers, as required by theory. In that case, spurious arrivals may contaminate the estimated Green's function obtained from the cross-correlation of field fluctuations.
UR: http://www.mines.edu/~rsnieder/Publications.html
DE: 7203 Body waves
SC: Seismology [S]
MN: 2007 Fall Meeting