HR: 08:00h
AN: S31C-01 INVITED     [Abstracts]
TI: Receiver Functions From Multiple-Taper Spectral Correlation: Backazimuthal Stacking, Single-Station Migration, and Jackknife Uncertainty
AU: * Park, J
EM: jeffrey.park@yale.com
AF: Dept of Geology and Geophysics, PO Box 208109 Yale University, New Haven, CT 06520-8109 United States
AU: Levin, V
EM: vlevin@rci.rutgers.edu
AF: Dept of Geological Sciences, Rutgers University 610 Taylor Road Wright Geological Laboratory, Piscataway, NJ 08854-8066 United States
AB: The multiple-taper correlation (MTC) algorithm (Park & Levin, 2000) for the estimation of teleseismic receiver functions (RFs) has desirable statistical properties, but needs enhancement to exploit its potential. In particular, theory predicts that a P-S conversion at an interface between anisotropic media will generate conjugate patterns of P-SV and P-SH converted waves with the backazimuth of the incoming wave. Using a weighted back-azimuthal stack of MTC RFs, one can evaluate whether the radial and transverse RF follow the anisotropic pattern, follow an independent pattern predicted for a dipping interface, or exhibit random behavior that suggests scattering by 3-D structure. Frequency averaging implicit in spectral cross-correlation restricts the MTC RF estimates to resolve Ps converted phases only at short delay times, appropriate to the upper 100 km of Earth's lithosphere. Ps conversions from deeper interfaces can be reconstructed by the MTC algorithm in two ways. Event cross-correlation (ECC) computes a cross-correlation of single-taper spectrum estimates for a cluster of events rather than for a set of eigenspectrum estimates of a single P coda. Moving-window migration (MWM) retains the multiple-taper approach, but cross-correlates the P-polarized motion with SH or SV component motion that is time delayed to focus on a Ps phase of interest. An alternative error-propagation based on the jackknife offers uncertainty estimates in the time domain.
DE: 3270 Time series analysis (1872, 4277, 4475)
DE: 3285 Wave propagation (0689, 2487, 4275, 4455, 6934)
DE: 7203 Body waves
DE: 7205 Continental crust (1219)
DE: 7220 Oceanic crust
SC: Seismology [S]
MN: Fall Meeting 2005