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The Tonga Trench is a convergent plate boundary. The trench lies at the northern end of the Kermadec-Tonga Subduction Zone, an active subduction zone where the Pacific Plate is being subducted below the Tonga Plate and the Indo-Australian Plate.uch oceanic trenches are important sites for the formation of what will become continental crust and for recycling of material back into the mantle. Along the Tonga Trench mantle-derived melts are transferred to the island arc systems, and abyssal oceanic sediments and fragments of oceanic crust are collected.
Plate tectonic boundaries of the southwest Pacific. Volcanoes in New Zealand result from the subduction of the Pacific Plate under the Indian-Australian Plate.The trench and subduction zone continues northeast from the North Island to the Kermadec Islands, Tonga, and Samoa.South of the North Island the tectonic boundary between the Indian-Australian an d Pacific plates changes to a transform fault. Modified from Johnson and others (1989).he trench and subduction zone continues northeast from the North Island to the Kermadec Islands, Tonga, and Samoa. South of the North Island the tectonic boundary between the Indian-Australian an d Pacific plates changes to a transform fault.