The Indo-Australian Plate was a major tectonic plate that included the continent of Australia and surrounding ocean, and extended northwest to include the Indian subcontinent and adjacent waters. It was formed by the fusion of Indian and Australian plates 43 million years ago. Recent studies, and seismic events such as the 2012 Indian Ocean earthquake, suggest that the Indo-Australian Plate has broken up into two or three separate plates due primarily to stresses induced by the collision of the Indo-Australian Plate with Eurasia along the Himalayas., and that the Indian Plate and Australian Plate have been separate since at least .
The eastern part (Australia) is moving northward at the rate of 5.6 cm per year while the western part (India) is moving only at the rate of 3.7 cm per year due to the impediment of the Himalayas. This differential movement has resulted in the compression of the former plate near its center at Sumatra and the division into the Indian and Australian Plates.
- (2010) Australia: The Land Where Time Began
- (1995) Geologists Find: An Earth Plate Is Breaking in Two
- R. R. Hillis, R. D. Müller. Evolution and Dynamics of the Australian Plate
- (2012) Earth cracking up under Indian Ocean
- (2012) April 2012 intra-oceanic seismicity off Sumatra boosted by the Banda-Aceh megathrust
- (2012) Newscientist image
- "Sumatra quake was part of crustal plate breakup: Study shows huge jolt measured 8.7, ripped at least 4 faults". Phys.Org. 2012-09-26. Retrieved 2012-10-06.