Another earthquake has hit Victoria. Are they becoming more frequent?

But is the frequency of earthquakes actually increasing significantly? The short answer is no.

Seismologists say this morning's tremor was actually an aftershock of the magnitude-5.9 quake that shook four states in 2021.

yup seems like it

Is it common for aftershocks to happen several years after the fact?

I was under the impression that they only really happened in the immediate aftermath of one.