Two small earthquakes have been recorded off the coast north of Wollongong on Monday night.
Geoscience Australia recorded two 2.0 magnitude earthquakes at 8.59pm and 9.20pm.
The earthquakes were recorded at nearly the same location at a depth of 10 kilomtres.
Senior seismologist at Geoscience Australia Hugh Glanville said there was one report from a north Wollongong resident who felt minor shaking.
"As it was a magnitude two earthquake you would need to be very close to feel it and you would usually feel a short shake or bang but would not likely see damage," he said.
"There are earthquakes in the region from time to time. There was previously one onshore and offshore in Kiama in 2015 and one in Picton in 2017. They are usually two or three magnitude.
"There have been 17 recorded in the past four years within 100 kilometres of this one."
Mr Glanville said the earthquake occurred because a small amounts of stress was released on the fault lines as the Australian tectonic plate moved northward.
The earthquake was recorded at many stations including Mount Annan Botanical Gardens, Wilton Park, Oakdale, Yarramundi, Canberra and Young.
"The seismic stations are very sensitive and can pick up small local earthquakes and ones overseas," he said.
If you felt the earthquake, you should visit Geoscience Australia and report it.
Read more: Wollongong earth shake was a quake: GA