On the 23rd of August, residents of Brookvale, Wheeler Heights, Cromer and even Canberra reported feeling tremors and that the ground was shaking. This was linked to a recorded 4.8 magnitude earthquake out of Muswellbrook in Northern New South Wales.

To find out why these were happening and if we are at threat in Sydney, earthquake geologist Dr Dee Ninis out of Monash University and the Seismology Research Center in Melbourne joined us this morning.