The 5.8-magnitude quake damaged buildings in Melbourne, but there were no immediate reports of serious injuries or deaths.
The tournament will continue without spectators because professional athletes are considered essential workers under the new restrictions in Victoria state.
With several positive tests among people arriving from abroad, and a strict quarantine, the Australian Open is not going the way organizers expected it would.
SARS-CoV-2 has been slowly changing in small ways, without getting more dangerous.
“That’s a heck of a birthday party to recall,” said Chief Commissioner Shane Patton of the Victoria police. Officers were led to a house where they found people hiding in the backyard, garage and under beds.