i don't think this is true. generally Australia doesn't have earthquakes but not far away in New Zealand which is part of the "ring of fire" they are more common
Australia
Yes, the west coast of the United States is the most likely to get earthquakes.
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.
Most likely the country(people) of Australia loves Australia the most.
alpine system
California
the USA
earthquakes are most likely to occur on the rim of tectonic plates
The answer is Earthquakes
On plate boundaries .
along fault lines
If you mean "where" earthquakes and volcanoes are most likely to occur it is in what's called the "ring of fire" which is the coastal ring around the Pacific Ocean.