Tsunamis are more frequent in the Pacific Ocean than in other oceans because of earthquakes in the " Ring of Fire " . Although the extreme western edge of the Ring of Fire extends into the Indian Ocean ( the point where the earthquake struck ) , no warning system exists in that ocean . Tsunamis there are relatively rare despite earthquakes being relatively frequent in Indonesia . The last major tsunami was caused by the 1883 eruption of Krakatoa . Not every earthquake produces large tsunamis : on 28 March 2005 , a magnitude 8.7 earthquake hit roughly the same area of the Indian Ocean but did not result in a major tsunami
1883 eruption of Krakatoa
1883 eruption of Krakatoa
2004 Indian Ocean earthquake and tsunami