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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.
The Tonga trench marks the Eastern boundary, where the Pacific plate is being subducted. The Tonga trench is one of the fastest subduction zones, with a rate going up to 24cm/year.(Smith and Price, 2006).he Niuafoâou micro-plate is located west of the Tonga plate. It is bounded to the east by its spreading center with Tonga, but lack a defined border with Tonga in the southeast (Zellmer and Taylor, 2001). The Pacific plate is subducting under it to the North.