List of Figures

1. Tectonic reconstruction of the New Hebrides - Tonga region

2. Development of asymmetrical arcs during asymmetrical rollback

3. Schematic sketch of experimental apparatus

4a, 4b, and 4c. Photographs and interpretation of experiments

4d, 4e and 4f. (continued)

4g, 4h and 4i. (continued)

5. Diagram showing the increase in deformed area

6. Schematic sketch of ocean-ocean subduction system

7. Schematic sketches illustrating extension observed in experiments

8. Schematic sketches to explain extension

9. Tonga Arc region

10. Bathymetric map of the Ryukyu Arc

11. Comparison between analogue results and structures