Canberra has shuddered through a magnitude 3.1 earthquake, which was felt widely across the city's north just after 10am.
The earthquake's epicentre was first estimated to be under Gungahlin, before it was revised to just north of the ACT's border near Sutton.
Residents in Harrison reported loud shaking, while one local thought something had hit their house when the earthquake hit, which had knocked items off shelves.
A 1.5 magnitude aftershock was recorded by Geoscience Australia to the east of the first quake at 10.17am.
Christine Douth from the Sutton Post Office and General Store said she heard a loud rumble and thought someone had run into the shop.
She said people started to gather outside the shop and bakery in the village to see what was going on, but it wasn't until she checked social media that she knew it was an earthquake.
More than 500 reports from people who felt the quake had come in by 10.45am, Geoscience Australia duty seismologist Hugh Glanville said.
"The region has had 97 earthquakes in the last 20 years, averaging five a year," Mr Glanville said.
If the earthquake's epicentre was within the ACT borders, it would have been the largest recorded quake in the territory in 100 years.
But there was little risk of damage at such a low magnitude, Mr Glanville said.
"You would just expect thump, like a train or a truck passing you," he said.
It's not the largest earthquake recorded in the region. A 3.4 magnitude earthquake was recorded north of Canberra in 2006.