They are less frequent in sedimentary basins like the Murray Basin or the Great Artesian Basin. The rocks in Eastern Australia are younger and softer, and absorb energy at a rate that is about the world average or greater. Earthquakes in Western and Central Australia, where the rocks are older, will be felt over greater distances than those in Eastern Australia. Another area where Australia tends to see earthquakes is around dams and reservoirs. Dams are usually built in valleys.
Valleys exist because active erosion is taking place.
Now to some of us, this sounds like an odd place to build a reservoir, but with the relative infrequency of quakes on this continent, the benefits outweigh the risks. If quakes are going to occur in or around a reservoir, they usually happen immediately after or within a year or two of filling the dams. This is what happened in 1973 at Warragamba, NSW, which saw a 5.5 shaker and again in 1996 in Thomson, Victoria, when a 5.1 earthquake resulted. 1 Low seismicity doesn't mean mild earthquakes. It just means that strong shakers happen less often.