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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.
Plates move together at convergent plate boundaries and lithosphere is destroyed. There is a compressional stress on the undeformed rocks which causes the crust to shorten. Re â¦ verse faults (the hanging wall moves up) occur at convergent plate boundaries. Different types of convergent plate boundaries include: oceanic-oceanic, oceanic-continental, continental-continental. In oceanic-oceanic an oceanic trench forms because the oceanic crusts subducts. The oceanic crust, because of its higher density, also subducts in oceanic-continental convergent plate boundaries, which are the most common. In the last case, continental-continental- two continents collide.