HR: 08:30h
AN: S21D-02    [Abstracts]
TI: Monitoring with Coda Wave Interferometry
AU: Gret, A
EM: agret@dix.mines.edu
AF: Center for Wave Phenomena Colorado School of Mines, 1500 Illinois Street, Golden, CO 80401-1887 United States
AU: * Snieder, R
EM: rsnieder@mines.edu
AF: Center for Wave Phenomena Colorado School of Mines, 1500 Illinois Street, Golden, CO 80401-1887 United States
AB: Aki has been a pioneer in monitoring the subsurface with coda waves and with guided waves. His analysis of temporal and spatial variations in coda Q has proven to be a powerful tool for monitoring purposes. We have extended his technique in new method called coda wave interferometry where changes in the full waveforms of coda waves are used to monitor changes in the subsurface. We have developed and implemented the theory to use this technique to monitor the following changes: a change in the seismic velocity, a change in scatterer locations, and a change in the location of earthquakes. As shown by Aki, the seismic coda is dominated by shear waves. Therefore our technique is primarily sensitive to changes in the S-velocity. Aki also worked on wave propagation in volcanoes. We have used coda wave interferometry to monitor two active volcanoes, Arenal (Costa Rica) and Mt. Erebus (Antarctica). I will give several examples to illustrate how coda waves can be used for monitoring purposes.
DE: 7260 Theory and modeling
DE: 7203 Body wave propagation
SC: Seismology [S]
MN: 2004 AGU Fall Meeting