There has been minor structure damage to buildings around Broome.
No tsunami alert was issued.
A strong 6.6-magnitude natural disaster struck off northwest Australia on Sunday, shaking buildings over a wide area but causing no immediate reports of damage or injuries. GeoScience Australia says it hit at a depth of 33 km, about 203 km offshore.
More than 200 reports came from Broome and another 251 were registered in Port Hedland.
"As it stands for as long as today, it is the biggest-equal quake in Australia ever recorded", GeoScience Australia duty seismologist Dan Connolly told The Guardian.
Some residents in Darwin in the Northern Territory also reported feeling tremors.
It was followed by a series of aftershocks including a 4.1 quake.
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'Never thought my first natural disaster would be in Broome, I thought it was a big plane or steam roller going by, ' another man said.
Derby resident Jody Gaunt was having a beer with friends when they felt the quake.
"She said everyone in the shopping centre bolted - the glass in the windows was shaking and everything, and everybody just started running".
Derby resident Jody Gaunt was having a beer with friends when they felt the first natural disaster.
At least four aftershocks have been reported following the natural disaster, ranging from 3.8 to 5.2 magnitude.
"I was outside and I just saw the cars moving. A few things fell off the walls onto the floors", she said.
Gary, who works at the Mercure Hotel in Broome, added: "It started off with a shake, it was not too insane and then it developed into quite a shake. It was not too strong, it nearly felt like when you are in a vehicle and the wind is a bit strong, and then it started picking up", he said. "[The] whole house shook and power is out".