Synthetic seismograms provide a crucial link between lithologic variations within a drill hole and reflectors on seismic profiles crossing the site. In essence, they provide a ground-truth for the interpretation of seismic data. Using a combination of core and logging data, we created synthetic seismograms for Ocean Drilling Program Sites 1165 and 1166, drilled during Leg 188, and Site 742, drilled during Leg 119, all in Prydz Bay, Antarctica. Results from Site 1165 suggest that coring penetrated a target reflector initially thought to represent the onset of drift sedimentation, but the lithologic change across the boundary does not show a change from predrift to drift sediments. The origin of a shallow reflector packet in the seismic line across Site 1166 and a line connecting Sites 1166 and 742 was resolved into its constituent sources, as this reflector occurs in a region of large-scale, narrowly spaced impedance changes. Furthermore, Site 1166 was situated in a fluvio-deltaic system with widely variable geology, and bed thickness changes were estimated between the site and both seismic lines.
1Handwerger, D.A., Cooper, A.K., O'Brien, P.E., Williams, T., Barr, S.R., Dunbar, R.B., Leventer, A., and Jarrard, R.D., 2004. Synthetic seismograms linking ODP sites to seismic profiles, continental rise and shelf of Prydz Bay, Antarctica. In Cooper, A.K., O'Brien, P.E., and Richter, C. (Eds.), Proc. ODP, Sci. Results, 188 [Online]. Available from World Wide Web: <http://www-odp.tamu.edu/publications/010/010.htm>. [Cited YYYY-MM-DD]
2Department of Geology and Geophysics, University of Utah, 135 South 1460 East, Room 719, Salt Lake City UT 84112, USA. Correspondence author: dahandwe@mines.utah.edu
3Department of Geological and Environmental Sciences, Stanford University, Building 320, Room 118, Palo Alto CA 94305, USA.
4Petroleum and Marine Division, Australian Geological Survey Organisation, GPO Box 378, Canberra ACT 2601, Australia.
5Borehole Research Group, Lamont-Doherty Earth Observatory of Columbia University, Route 9W, PO Box 1000, Palisades NY 10964, USA.
6Leicester University Borehole Research, Department of Geology, University of Leicester, University Road, Leicester LE1-7RH, United Kingdom.
7Department of Geology, Colgate University, 13 Oak Drive, Hamilton NY 13346, USA.
Initial receipt: 23 July 2002
Acceptance: 15 August 2003
Web publication:
11 February 2004
Ms 188SR-010