A small earthquake has been detected off the NSW Central Coast, with residents reporting feeling the ground shake from Sydney to Newcastle.
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Geoscience Australia said the magnitude 4 earthquake occurred at 10:02am on Tuesday, about 100 kilometres east of Gosford. The earthquake was initially measured at magnitude 4.1, but was later downgraded.
The Joint Australian Tsunami Warning Centre said there was no tsunami threat to the Australian mainland, islands or territories from the earthquake.
Marco Maldoni, a duty seismologist at Geoscience Australia, said the organisation had received up to 100 reports from people who felt the earthquake.
"There was no damage from an earthquake this size, but we received lots of reports," he said.
"Those people reported about 10 seconds worth of shaking, and a few reports of shaking trees and buildings shaking, and picture frames askew."
Mr Maldoni said the last time a magnitude 4 earthquake was recorded in NSW was in 2012 in Tamworth.
"It is not unusual to have earthquakes in this part of the world. Looking at the past 50 years worth of data, there have been 42 earthquakes. It's not unusual, and we may well have further aftershocks," he said.
Magnitude 4.1 #Earthquake Offshore Gosford, NSW has been felt. No #tsunami threat https://t.co/eUaVPY0T7C pic.twitter.com/C1h2DueBmS— BOM Australia (@BOM_au) June 7, 2016
