Friday, 31 August 2007
5.PS-130
Synthetic seismograms and spectral cycles on the Andvord and Schollaert Drifts: Antarctic Peninsula
P. L. Manley, Geology, Middleburry College, 427 McCardell Bicentennial Hall, Middleburry, VT 05735, Anguilla and S. Brachfeld, Department of Earth and Environmental Studies, Montclair State University, Montclair, NJ 07043.
The geological significance of seismic reflectors within large sediment deposits of the Gerlache Strait (Schollaert Drift) and the mouth of Andvord Bay (Andvord Drift) has been examined using synthetic seismograms. The seismograms generated from the physical properties in jumbo piston cores taken at each of these drifts (28JPC and 18JPC respectively) show good agreement with the field seismic profiles when core disturbance is taken into consideration. Both cores suggest an under-sampling of up to 30% (or compaction) during coring. This leads to inaccuracy in the evaluation of past sedimentation rates and thus interpretations based on these rates may be biased. In particular we show how spectral results may be modified by coring disturbances.