HR: 11:15h
AN: S32A-04 INVITED     [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
AU: Baig, A M
EM: abaig@eos.ubc.ca
AF: Department of Earth and Ocean Sciences, The University of British Columbia, 6339 Stores Rd, Vancouver, BC V6T 1Z4 Canada
AU: Mercier, J
EM: jmercier@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 S contribution to the teleseismic 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 P-to-P scattering or, accordingly, compressional properties of the Earth's subsurface. An improved estimate of the teleseismic P Green's function can be achieved through consideration of its spectral characteristics. Under conditions typical of the real Earth the 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 effect a comprehensive source-impulse response deconvolution that affords an improved estimate of the teleseismic P-Green's function and better characterization of discontinuties in compressional properties.
DE: 7203 Body wave propagation
DE: 7218 Lithosphere and upper mantle
DE: 7260 Theory and modeling
SC: Seismology [S]
MN: 2005 Joint Assembly