Parts of NSW have been rattled by a second earthquake, one day after thousands of people felt a similar-sized quake.
The earthquake hit Muswellbrook, about 120km northeast of Newcastle in the NSW Hunter region, about 4.30 on Saturday according to Geoscience Australia.
More than 600 people reported feeling the tremor in the hours after it struck as far away as Port Macquarie and Wollongong.
NSW Police said local officers were not aware of any injuries.
"Residents are advised to alert their local relevant authorities of any injury or damage," the force said in a statement.
The State Emergency Service received one report of a collapsed chimney from Saturday's quake.
NSW Ambulance has not received any requests for a call out near where it hit.
Energy provider Ausgrid said about 2500 customers in the area were left without power but the majority had it back within an hour.
Geoscience Australia recorded it as a 4.5-magnitude quake while NSW Police described it as 4.7-magnitude.
Muswellbrook Shire Council said part of the area had been left without water following aftershocks, but that had since been resolved.
There is no tsunami threat, the Bureau of Meteorology said on Saturday.
It comes a day after a thousands of people reported feeling a 5.0-magnitude quake that struck Denman, around three hours north of Sydney, at just after noon on Friday.
Thousands of people reported feeling tremors afterwards, including three hours' drive away in Sydney.
