HR: 0800h
AN: DI41A-1247    [Abstracts]
TI: Imaging Upper Mantle Interfaces under the Pacific Plate
AU: Park, J
EM: Jeffrey.Park@yale.edu
AF: Yale University, Kline Geology Laboratory PO Box 208109, New Haven, CT 06520
AU: * Leahy, G M
EM: garrett.leahy@yale.edu
AF: Yale University, Kline Geology Laboratory PO Box 208109, New Haven, CT 06520
AB: The Pacific provides an ideal region for the study of upper mantle interfaces due to its broad extent and relatively homogeneous structure. Multi-taper correlation (MTC) methods for the estimation of teleseismic receiver fuctions (RF's) provide a natural way to study these interfaces due to their sensitivity to impedence contrasts and desirable statistical properties. Recent improvements to the MTC algorithm (Park and Levin, 2005 GJI, submitted) permit the reconstruction of Ps conversions from interfaces below 100km depth. Here we apply these new techniques to imaging interfaces in the upper mantle beneath four ocean islands in the Pacific (broadband stations RAR, PPT, POHA, and XMAS). In particular, we attempt to constrain the depth, sharpness, and topography of the 410 km and 660 km discontinuities, and examine evidence for a low velocity zone above the transition zone in this area.
DE: 4465 Phase transitions
DE: 7208 Mantle (1212, 1213, 8124)
DE: 7299 General or miscellaneous
SC: Study of Earth's Deep Interior [DI]
MN: Fall Meeting 2005