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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.
Click on the picture to see a larger view. 1  Oceanic-Oceanic plates consist of an oceanic crust called sima. 2  Continental-Continental plates consist of a continental crust called sial. 3  Convergent Boundaries-A convergent boundary is where two tectonic plates push together. The Mariana Trench is the deepest part of the ocean. 2  It is formed by a convergent boundary between the Pacific Plate and the Mariana Plate. 3  The Pacific Plate is being subducted under the Mariana Plate. 4  Scientists are now able to track the movement of tectonic plates using GPS.