Figure 5. Velocity model of profile Lusigal 12 between Sites 898 and 901. Next to the drill sites, the model was derived from iterative prestack depth migration, and extrapolated to the whole, analyzed segment of LG12 for poststack depth migration shown here. The model allows the following units to be identified: basement (Vp = 5.5 km/s), postrift (Vp = 1.7-3.1 km/s), synrift (Vp = 3.2-4 km/s), and prerift (Vp = 4.1-4.7 km/s) sediments capping the tilted block at Site 901, where prerift sediments of Tithonian age had been drilled (Shipboard Scientific Party, 1994c), and probably east of Site 900. Figure 6 and Figure 7 show the models derived by prestack depth-migration in more detail next to the drill sites.