Figure 13: Tonga-Kermadec Arc and Lau Basin-Havre Trough, showing locations and major tectonic features. The numbers 834-839 refer to ODP sites (Leg 135). Tonga and Kermadec islands are numbered: 1, Tafahi; 2, Niuatoputapu; 3, Fonualei; 4, Late; 5, Metis; 6, Kao; 7, Tofua; 8, Hunga Ha’apai and Hunga Tonga; 9, Eua; 10, Ata; 11, Raoul Group; 12, Macauley; 13, Curtis; 14, L’Esperance; 15, Niua fo’ou. Other abbreviations: PR, Peggy Ridge; KTJ, Kings Triple Junction; CLSC, ILSC and ELSC, Central, Intermediate and East Lau Spreading Centres; VF, Valu Fa Ridge. Inset shows DSDP Sites 204 and 275, and ODP Site 596. Bathymetric contours in meters.