Yes, they are likely to occur.
Fiji dont usually get Earthquakes or tsunamis. Fiji only faces tropical hurricanes every year and so. The recent Earthquake in Chile (March 04/2010) saw huge waves in Fiji and all over the south pacific because of its great impact.
You can determine if you live in a area were earthquakes are likely to occur by going on line and looking for past seismographs in your area.
Australia
tsunamis are likely
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.
earthquakes are most likely to occur on the rim of tectonic plates
alpine system
Along fault lines.
along fault lines
The answer is Earthquakes
Tectonic Plate boundaries.