|
 |
 |
 |
 |
 |
 |
 |
 |
 |
 |
| Structure | Volcanics | Refl. Seismic | Thickness | Heat Flow |
Normal Faults from Reflection Seismic Data
Because of the relative ease of marine operations compared to terrestrial expeditions, marine reflection seismic is one of the most abundant type of data from Antarctica. The Ross Sea region has been fairly well explored seismically. Reflection seismic data reveal the existence of several parallel horsts and grabens/half grabens in the Ross Sea (Figure 15). These horsts and grabens parallel the onshore TAM, but not the axis of maximum uplift in the TAM.
 |
||||
| Figure 15. Location of rift structures in the Ross Sea. Cooper et al., 1987. | ||||
An example of the seismic data is shown in Figure 16.
 |
||||
| Figure 16. Reflection seismic data (TWT) over the western flank of the Victoria Land Basin. Cooper et al., 1987. | ||||
The age, thickness, and lithology of acoustic units V1-V7 are given in Table 1. Note that there is a maximum of 14 kilometers of post-Jurassic sediment present in the Victoria Land Basin.
 |
||||
| Table 1. Seismic units shown on seismic data and other figures. Cooper et al., 1987. | ||||
A schematic cross section across the Victoria Land Basin is shown in Figure 17.
 |
|||
| Figure 17. Schematic cross-section across the Victoria Land Basin. Cooper et al., 1987. |