On 26 December 2004 a tsunami occurred in the Indian Ocean. It was the result of the Indio-Australian Plate subducting below the Eurasian Plate. It was caused by an earthquake measuring more than magnitude 9. The earthquake caused the seafloor to uplift, displacing the seawater above.
In open ocean the tsunami measured less than 1 metre high.
The tsunami travelled at speeds up to 800km per hour.
When the Tsunami reached the shores, the height of the wave increased to 15 metres in some areas.