Estimated at between 5.8 and 6, which is the high end of moderate by California standards but very large for Australia. Reports of scattered structural damage in Melbourne, but no injuries as yet. But the earthquake was centered about 100 km/60 miles to the east closer to a town of ~27,000 called Traralgon. There might be more damage around there.
https://earthquakes.ga.gov.au/event/ga2021sqogij
https://earthquake.usgs.gov/earthquakes/.../executive
https://www.youtube-nocookie.com/embed/10ANs7_zatA
https://www.youtube-nocookie.com/embed/p8J2hkdyfMk
https://earthquakes.ga.gov.au/event/ga2021sqogij
https://earthquake.usgs.gov/earthquakes/.../executive