HR: 1340h
AN: S33A-1088    [Abstracts]
TI: Green's Functions, Source Signatures, and Teleseismic Body Wavefields
AU: * Bostock, M G
EM: bostock@eos.ubc.ca
AF: Department of Earth and Ocean Sciences, The University of British Columbia, 6339 Stores Rd, Vancouver, BC V6T 1Z4 Canada
AB: The separation of Earth's impulse response or Green's function from earthquake source signature is a canonical problem in seismology and an important prerequisite to the exploitation of scattered waves in structural studies. Receiver functions represent a leading order estimate of the {\it S} contribution to the teleseismic {\it P} Green's function and have proven exceptionally useful in characterizing discontinuous shear structure in studies of the lithosphere and upper mantle. They provide no information, however, on {\it P}-to-{\it P} scattering or, accordingly, compressional properties of the Earth's subsurface. An improved estimate of the teleseismic {\it P} Green's function can be achieved through consideration of its spectral characteristics. Under conditions typical of the real Earth, the {\it P} component can be shown to be minimum phase; thus it may be recovered soley from knowledge of its power spectrum. The minimum phase property can be exploited using both auto- and cross-spectra of multichannel measurements to accomplish a comprehensive source-impulse response deconvolution that affords an improved estimate of the teleseismic {\it P} Green's function and the potential for imaging of short wavelength heterogeneity in compressional properties.
DE: 7260 Theory and modeling
DE: 7203 Body wave propagation
DE: 7218 Lithosphere and upper mantle
SC: Seismology [S]
MN: 2004 AGU Fall Meeting