Macquarie Triple Junction
The Macquarie Triple Junction is a geologically active tectonic boundary located at 61°30′S 161°0′E / 61.500°S 161.000°ECoordinates: 61°30′S 161°0′E / 61.500°S 161.000°E at which the Indo-Australian Plate, Pacific Plate, and Antarctic Plate collide and interact. The term Triple Junction is given to particular tectonic boundaries at which three separate tectonic plates meet at a specific, singular location. The Macquarie Triple Junction is located on the seafloor of the southern region of the Pacific Ocean, just south of New Zealand. This tectonic boundary was named in respect to the nearby Macquarie Island, which located southeast of New Zealand.
Our understanding of the evolution of the Macquarie Triple Junction was made possible due to extensive research of the regions tectonic magnetic anomalies as well as local fractures reconstruction. The origin of the Macquarie Triple Junction has been interpreted to have occurred 47.91 Mya (million years ago), based on Anomaly 21. Thorough reconstruction of the Macquarie Triple Junction begins at 33.3 Mya, in respect to Anomaly 13o, and can be simply described as a southeastward migration of approximately 1100 km in respect to the Australian Plate. The total migration was largely driven by the Australian–Pacific transform boundary.
...
Wikipedia