That would depend on where the tsunami struck and how big it was. Much of Australia's coastline is very sparsely populated, but a tsunami hitting one of the coastal towns or cities would wreak havoc.
In the news, people said a tsunami caused the damage in Japan. (There is a rumor when this happened, the world would end forever.)
They are about the same, but if I had to say: Tsunami.
That really depends on how much damage it caused. But a tsunami as devastating as the one that just hit japan, would cost hundreds of billions.add I understand that some coastal land in Hawaii has been cleared from development because of too-frequent tsunami impact. Very sensible.
seafloor spreading
A tsunami is an ocean wave that is caused by an earthquake. It would occur after an earthquake.
There is little reason for a tsunami to change the climate. Climates are affected by changes in the distribution of warm and cold air. Tsunami don't do this. Tsunami are caused by undersea earthquakes and these generate an insignificant amount of heat, made even more insignificant by the huge heat capacity of the ocean. For a tsunami to affect climate it would have to be caused by a major volcanic eruption. In such a case, the volcanic activity would get the blame, not the water. The only way a tsunami might be more closely related to a climate change would be this: Suppose a tsunami were caused by a huge shifting of the ocean bed and that this caused a major change in an ocean current. That would result in a change in the earth's heat distribution and thus its climate. But still, it's the earthquake getting the blame for both - the tsunami and the climate change.
There would be catastrophic flooding and water damage from the two disasters. A tsunami can itself be considered a kind of flood.
It would be sheer coincidence if they did. A tornado is primarily a land storm. There can be a tornado over the surface of water (called a waterspout), but either way, tornadoes have nothing to do with tsunamis, which are caused by undersea quake movements.
Earthquakes don't generate tsunamis - a tsunami is caused by different atmospheric pressure systems coming together. An underwater earthquake would generate a tidal wave, which is caused by the water displaced by the earthquake.
Earthquakes usually cannot knock over trees, even if they would level buildings. In a natural area, the worst an earthquake would cause is a landslide. The exception would be an underwater earthquake that caused a tsunami, because tsunamis can cause a lot of damage, even in the wild.
Tsunamis always begin with an earthquake. Sometimes the earthquake is far away from land, and the earthquake itself might not cause catastrophic damage. But the quake happens at sea, and it causes a massive shift in the sea floor. This gets the tsunami going. Tsunamis contain massive amounts of energy and move very rapidly. The recent Japanese quake was close enough to land to cause massive damage, and then the tsunami followed and caused massive damage on its own.
Food would be able to enter the lungs.