CONCLUSIONS

1. Correlations between core, logging, and seismic data from ODP Site 1149 have been established through the construction of a synthetic seismogram from a combination of downhole and shipboard laboratory measurements of velocity and density.
2. The major reflections and general seismic facies characteristics of the observed SCS profiles are well reproduced by the synthetic seismogram. The close match between synthetic and observed seismogram displayed using true amplitudes allows the synthetic to successfully constrain depth to traveltime correlations and requires that laboratory velocities be increased by ~4.5% in the upper transparent seismic facies. The velocity increase is consistent with results from other empirical methods that correct laboratory velocities for the effects of rebound and core disturbance.
3. The depth-to-traveltime correlations indicate that the lithologic unit boundaries given by the Shipboard Scientific Party (2000c) must be adjusted to slightly greater traveltimes as follows: Unit II/III boundary at 226 msbsf rather than 200 msbsf, Unit III/IV at 336 msbsf rather than 280 msbsf, and top of oceanic crust at 438 msbsf rather than 420 msbsf.
4. The seismic facies identified at Site 1149 can be compared to the regional seismic facies descriptions of the northwest Pacific by Ewing et al. (1968). No other boreholes within 1000 km of Site 1149 have sampled the complete sedimentary section and top of oceanic crust seaward of the Izu-Bonin trench. Thus, the results of the correlation between physical and seismic stratigraphy at Site 1149 have regional significance and can now be extended basinwide using preexisting regional MCS and analog SCS profiles.