No
No, Sydney was not directly affected by the tsunami that hit Brisbane, Australia. Tsunamis are usually localized events and their impact is limited to specific areas along the coastline where they make landfall.
Theoretically, a tsunami could hit anywhere along Australia's coastline. The east coast is highly likely due to the position of a major fault line in New Zealand, and the west coast could also be hit because of the potential for seismic activity in the Indian Ocean.
Sydney is most likely to get hit by a tsunami, because it is the only capital city in Australia which is in a high tsunami risk zone. But don't be worried, Australia is relatively sheltered from earthquakes and tsunamis, so the chance of getting hit by a tsunami is still quite low.
New Zealand and Australia.
yes
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.
Australia has been relatively free of major damaging tsunamis. The largest tsunami to hit Australia occurred on the northwestern coast at Cape Leveque in August 1977. This tsunami was 6m in height, but no one was killed. Perhaps the second-largest tsunami to hit Australia's shores was one which hit in June 1994. Again, the northwest coast was hit, including Broome, King Bay, Onslow and Carnarvon. In some coastal areas, fish and other ocean creatures were carried inland for 300 metres. Whilst no people died in Australia, this same tsunami killed 200 people just four hours earlier in Java.
Australia is not subject to volcanic eruptions on the mainland. The only volcanoes on Australian territory are those on the remote Heard and MacDonald Islands.Whilst Australia could be hit by a major tsunami, it has not yet happened.It is conceivable that Australia could have avalanches, but this also is rarely an issue.
No
There are yet no instruments which could predict a Tsunami. So, it can't be told whether a tsunami will come or not.
The tsunami hit because of the earthquake shifted the ground and caused the tsunami.