An aftershock has rumbled the earth near Appin on Monday morning, some 16 hours after an earlier earthquake hit the area.
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The latest earthquake measured 1.5-magnitude and occurred at 6.30am, at a recorded depth of four kilometres.
Geoscience Australia has pinpointed the epicentre of the quake on Dredge Avenue in Douglas Park, at the site of school camp provider AGH Camps.
The business' owner Brad Hicks said no one was on site at the time, so he had no reports of any rumblings.
Geoscience Australia senior seismologist Jonathan Griffin said a quake of this size would typically not be felt.
However, the agency received 13 'felt reports' since the event, which Mr Griffin said suggested that the quake might have been shallower than recorded.
He explained that for an earthquake of such a small size, it could be difficult for instruments to locate the point of origin.
Mr Griffin suggested the fact a quake had occurred the day before meant more people were also alert to any movement, and the time of day might have played a role.
Thirty-five reports were made about the earlier earthquake, which struck shortly after 2pm on Sunday.
That quake, which occurred north of Douglas Park, measured in at magnitude 3.1 and occurred at a depth of three kilometres.
Mr Griffin said there had been about 50 earthquakes within a 100-kilometre radius of this area in the past 10 years.
Earlier notable events include a 4.5-magnitude quake at Appin in 1999, which caused loss of power and some minor damage, as well as a 1973 earthquake at Picton that measured 5.5 magnitude.
Mr Griffin said that while Australia sat in the middle of a tectonic plate, this plate was getting compressed along its boundaries, leading to small faults and fractures.
The earthquakes this week have had no impact on the operations at South32's Appin mine, nor its Dendrobium mine at Kembla Heights.
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Natalie Croxon
Reporter at the Illawarra Mercury, mostly covering social affairs. Previously of the Bendigo Advertiser, Northern Daily Leader and Quirindi Advocate. Our Watch award winner.
Reporter at the Illawarra Mercury, mostly covering social affairs. Previously of the Bendigo Advertiser, Northern Daily Leader and Quirindi Advocate. Our Watch award winner.
