The town of Tennant Creek in the Northern Territory had an earthquake on Thursday night.
Geoscience Australia spokesperson Jonathan Bathgate says a magnitude 4.2 quake occurred there at about 9pm.
He says the last big tremor in the area was 25 years ago, but seismic activity is not unusual for the region.
"The seismicity has continued since those earthquakes in 1988, which were magnitude 6.3 up to 6.7," Mr Bathgate told the ABC. "They had three earthquakes on the one day.''