HR: 0830h
AN: S41B-04    [Abstracts]
TI: Improved Teleseismic Green's Functions and Crustal Multiples
AU: * Mercier, J
EM: jmercier@eos.ubc.ca
AF: Department of Earth & Ocean Sciences, University of British Columbia, 6339 Stores Rd, Vancouver, BC V6T 1Z4 Canada
AU: Bostock, M G
EM: mbostock@eos.ubc.ca
AF: Department of Earth & Ocean Sciences, University of British Columbia, 6339 Stores Rd, Vancouver, BC V6T 1Z4 Canada
AU: Baig, A M
EM: abaig@eos.ubc.ca
AF: Department of Earth & Ocean Sciences, University of British Columbia, 6339 Stores Rd, Vancouver, BC V6T 1Z4 Canada
AB: Over the past two decades, "receiver functions" have proven to be a useful tool to investigate crustal structure. As they represent a first-order approximation to the S-wave component of the teleseismic-P Green's function, receiver functions provide valuable information on physical properties related to shear modulus. However, the use of the P-component seismogram as a proxy for the source precludes the recovery of information on discontinuous structure involving constrasts in compressional modulus. By deconvolving improved estimates of complex source time functions generated by earthquakes, one may move beyond the conventional receiver function paradigm to a more accurate approximation to the Green's function. Using a method described by Baig et al. [2005, submitted to JGR], we present estimates of P-component teleseismic-P Green's functions at several stations of the Canadian National Seismic Network that clearly show the Ppmp crustal multiple. The identification and characterization of this phase in studies of the lithosphere will afford better constraints on lithology and represent a significant narrowing of the gap between active- and passive-source seismic imaging.
DE: 7203 Body wave propagation
DE: 7205 Continental crust (1242)
DE: 7218 Lithosphere and upper mantle
DE: 7260 Theory and modeling
SC: Seismology [S]
MN: 2005 Joint Assembly