Earth Tremor in Melbourne tonight

Tonight around 9:05pm I received a phone call from my BIL to ask if I had felt anything in the last 10 mins. I had but wasn't sure if I had imagined it. He lives close to the city and said that we had just had an earth tremor around 8:55pm. It was apparently stronger closer to the city. I live further out in the SE suburbs and it was just like someone was gently shaking the house for around 10 secs. The Age online reported it at 9:29pm, so my BIL (who happens to work at the Bureau of Meteorology) was correct. He thought that it might measure around 3 on the richter scale.
I've just checked The Age online and at 10:04pm they reported that it measured 4.6 on the richter scale and was felt as far away as Warragul & Leongatha in Gippsland. No damage has been reported, just a lot of rattling windows.
Goodness, Mother Earth has been giving Australia a beating recently with floods, extreme heatwaves, bushfires & now earth tremors. Maybe she is trying to tell us something...treat her better & she'll recipricate.