HR: 0800h
AN: S31A-0211    [Abstracts]
TI: Interferometric seismic imaging of sedimentary basins using local-earthquake coda
AU: * Abe, S
EM: sabe@jgi.co.jp
AF: JAPEX Geoscience Institute, Inc., 1-5-21, Otsuka, Bunkyo-ku, Tokyo, 112-0012, Japan
AU: Sato, H
EM: satow@eri.u-tokyo.ac.jp
AF: Earthquake Research Institute, Univ. 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, Univ. of Tokyo, 1-1-1 Yayoi, Bunkyo-ku, Tokyo, 113-0032, Japan
AU: Iwasaki, T
EM: iwasaki@eri.u-tokyo.ac.jp
AF: Earthquake Research Institute, Univ. 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., 1-5-21, Otsuka, Bunkyo-ku, Tokyo, 112-0012, Japan
AB: In recent years, the correlation-type reciprocity theorem for one-way wave fields has been used to derive relations between the reflection and transmission responses of an arbitrary 3-D inhomogeneous medium with distributed sources below irregular layers. This concept is equivalent to the extraction of pseudo-shot records related to surface-related multiples at all receiver stations. Based on this generalized relation, the interferometric seismic imaging(ISI) in the presence of passive seismic sources can be simulated by cross-correlating the transmission responses recorded at dense receiver array. The ISI inherently realizes symmetric pseudo-shot-receiver sampling, and prevents irregularities of offset distribution in CMP ensembles. We have investigated the possible application of ISI to local earthquake 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 model of sedimentary basin are given to investigate the application of ISI approach to first-order free-surface multiples in local- earthquake coda. The numerical modeling results demonstrate the potential imaging capabilities of ISI for the sedimentary basin structure with a high spatial resolution. ISI has also been applied to local earthquake data accidentally recorded during a seismic reflection survey across the Kanto basin, central Japan. We compare the basement structure of Kanto basin estimated from local-earthquake coda with the prestack migrated profile of active seismic experiment.
DE: 7203 Body waves
DE: 7260 Theory
DE: 8169 Sedimentary basin processes
SC: Seismology [S]
MN: 2007 Fall Meeting