What are the names of the three tectonic plates in the Tonga Trench?

The Tonga Trench is primarily associated with three tectonic plates: the Pacific Plate, the Indo-Australian Plate, and the smaller Tonga Plate. The Pacific Plate is being subducted beneath the Indo-Australian Plate, creating the trench. The Tonga Plate plays a role in the complex interactions in this region, contributing to the geological activity.