Indo-Australian Plate
The Indo–Australian Plate was formed after the amalgamation of the Indian Plate and the Australian Plate some 45 million years ago. However, there is a relative movement between the Indian Plate and the Australian Plate. A process which would eventually split the Indo-Australian Plate in two probably started 8 to 10 million years ago and is still taking place. The 2012 Indian Ocean earthquake is associated to the reactivation of the NNE-striking sea floor fabric.