HR: 0800h
AN: S41A-0967    [Abstracts]
TI: Pseudo-Reflection Profiling of Scattered Teleseismic Body Wave
AU: * Abe, S
EM: sabe@jgi.co.jp
AF: JAPEX Geoscience Institute, Inc., Meikei Building 1-5-21, Otsuka, Bunkyo-ku, Tokyo, 112-0012 Japan
AU: Kurashimo, E
EM: ekura@eri.u-tokyo.ac.jp
AF: Earthquake Research Institute, University of Tokyo, 1-1-1 Yayoi, Bunkyo-ku, Tokyo, 113-0032 Japan
AU: Sato, H
EM: satow@eri.u-tokyo.ac.jp
AF: Earthquake Research Institute, University of Tokyo, 1-1-1 Yayoi, Bunkyo-ku, Tokyo, 113-0032 Japan
AU: Hirata, N
EM: hirata@eri.u-tokyo.ac.jp
AF: Earthquake Research Institute, University of Tokyo, 1-1-1 Yayoi, Bunkyo-ku, Tokyo, 113-0032 Japan
AU: Kawanaka, T
EM: taku@jgi.co.jp
AF: JAPEX Geoscience Institute, Inc., Meikei Building 1-5-21, Otsuka, Bunkyo-ku, Tokyo, 112-0012 Japan
AB: Prestack migration of forward scattered P to S conversions in the coda of teleseismic P-wave is emerging as a new technique for enhancing the resolution of lower crust profile. However, image quality of receiver function can be substantially compromised by irregularities in data coverage of teleseismic earthquake arrivals and instabilities in the spectral deconvolution. Over the past few years, the correlation-type reciprocity theorem for one-way wave fields has been extended to derive relations between the transmission and reflection responses of an arbitrary 3-D inhomogeneous medium. Based on this generalized relation, the pseudo-reflection profile (PRP) in the presence of passive seismic sources can be simulated by cross-correlating the transmission responses recorded at dense receiver array. The PRP approach inherently realizes symmetric pseudo-shot-receiver sampling, and prevents irregularities of offset distribution in CMP ensembles. We have investigated the possible application of PRP approach to teleseismic data, which ensures the basic assumption of the correlation-type reciprocity theorem that the seismic source is located beneath the all reflectors to be reconstructed. Synthetic seismograms simulated by the elastic pseudospectral method for a simple 2-D crustal model are given to investigate the application of PRP approach to multi-component teleseismic data. We compare the images that have been produced by PRP approach and prestack depth migration of receiver functions. The numerical modeling results demonstrate the potential imaging capabilities of PRP for crustal structure with a high spatial resolution.
DE: 7203 Body waves
DE: 7205 Continental crust (1219)
DE: 7218 Lithosphere (1236)
DE: 8110 Continental tectonics: general (0905)
SC: Seismology [S]
MN: Fall Meeting 2005