The Hunter was rocked by four earthquakes in 24 hours that were felt as far away as Sydney.
On Monday, a 3.8 magnitude earthquake struck at Muswellbrook at 3.27pm.
Geoscience Australia estimated the quake occurred at a depth of 2 kilometers and was located between Edderton and Muswellbrook.
The second quake, which had a magnitude of 4.4, occurred nearby at Denman at 4.29pm.
A third quake registering a magnitude of 2.9 was recorded in the same area around 6.11pm.
The Geoscience Australia website was inundated by reports of the quakes from as far away as Sydney.
Office workers in Honeysuckle reported their buildings had moved at the time of the second quake.
On Tuesday morning, residents woke to news that a fourth earthquake had hit near Muswellbrook at a magnitude of 3.0.
Geoscience Australia seismologist Hadi Ghasemi said it was likely more earthquakes would occur in the area in coming days.
"There are a number of weak faults in that area that are contributing to these miniquakes and. It's hard to link it to a particular fault," he said.
There have been more than 100 small earthquakes in the Upper Hunter since 2000. All have been at a relatively shallow depth and between 1.5 and 4.4 in magnitude.
Seven earthquakes ranging in magnitude between 2.1 to 3.5 were recorded near Muswellbrook over a five day period in September 2018.
Geoscience Australia is always interested in hearing from anyone who feels a tremor.
To fill out a felt report, visit Geoscience Australia's website