It is difficult to determine the "worst" natural disaster as each disaster has varied impacts depending on factors like location and population density. Some of the most devastating natural disasters include earthquakes, tsunamis, hurricanes, and volcanic eruptions. The severity of the disaster is typically measured by the loss of life, property damage, and long-term impacts on the affected area.
As of October 2009, Australia's most recent natural disaster is the massive bushfires in the Rockhampton region.
The famine or the heat
Hurricane Katrina was the costliest U.S. natural disaster, and one of the deadliest. So it ranks as one of the worst U.S. disasters, but probably not the worst.
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Granville Train Disaster - 18 January 1977, Granville, New South Wales
The flood of 2008 was the worst natural disaster in the USA
Drought remains an ongoing natural disaster, but early in 2009, Australia was hit badly by both bushfires in Victoria, in the south and massive floods in Queensland's north.
Floods in Brazil Floods in Australia
The worst cyclone to hit Australia was Cyclone Mahina. It hit north Queensland on 4 March 1899. A category 5 cyclone, it resulted in the greatest death toll of any natural disaster in Australia.Australia's second worst cyclone was Cyclone Tracy, which officially killed 71 people and destroyed 9,000 homes on 25 December 1974.
No such figure will ever be known. Certainly more than half the world will be aware of the disaster.
Bushfires are a common natural disaster in Australia.